JP2004302318A - Music data generation system, music data generation device, and music data generation method - Google Patents

Abstract

An object of the present invention is to make it possible to perform correct chording for a given melody with a small amount of calculation.
An input of a melody is received, and an approach note is determined from the melody. Then, a chord is generated in the common chord area based on the constituent tones except for the determined approach note, integrated with the melody, and output as music data. When determining an approach note, first, a provisional approach note assumed is determined from a given melody, and a chord candidate group generated based on the provisional approach note is generated. Then, it is determined whether or not the provisional chord candidate group conforms to the chord progression stored in the storage means in advance. If it is determined that the chord candidate group does not conform to the chord progression, The interpretation of the approach note in the common chord area to which is assigned is corrected, and chord generation processing is performed again.
[Selection] Fig. 6

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a system for generating chorded music, and more particularly, to a system for generating music in consideration of input melody approach notes.
[0002]
[Prior art]
Currently, for example, software called a singer-songwriter is commercially available to support a user's music composition activity. This software is intended for pop music, and receives a melody input via a personal computer or the like and analyzes the constituent sounds to generate chords corresponding to the melody.
[0003]
[Problems to be solved by the invention]
However, this singer-songwriter software does not have a function of identifying approach notes such as a transitional sound, an impulsive sound, an embroidery sound, a mooring sound, a preceding sound, and a missed sound that often appear in music. For this reason, there are cases where the chord assignment for the given melody does not match. Normally, a chord assignment for a given melody is handled differently depending on whether each tone in the melody is an additional tone, not the melody itself. Therefore, it is not possible to generate a chord that perfectly fits the melody simply by generating a chord from a given tone sequence.
On the other hand, Patent Literature 1 and the like below exist as literatures that deal with approach notes.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 7-111636
[0005]
The document described in this publication considers whether a sound in a melody can be interpreted as a chord component sound or an approach note when determining whether a chord given as a chord setting sound can be set. is there.
[0006]
However, according to Japanese Patent Publication No. Hei 7-111636, when a set of chord candidates that can be set is determined, a process that first excludes a sound that can be interpreted as an approach note from consideration when setting it as a chord candidate group is performed. Therefore, chord candidates for all constituent tones must be obtained, and an enormous number of chord candidate groups must be generated. Furthermore, interpretation of approach notes generally suffers from multiple interpretations. For example, even for the same sound, there are cases where the interpretation of the approach note is different in consideration of the chord settings before and after. In this regard, in the method disclosed in Japanese Patent Publication No. Hei 7-111636, the approach note is determined without considering the setting of the front and rear chords, and therefore, there is a possibility that an error may occur in the determination of the approach note. For this reason, the approach note cannot be used sufficiently or correctly, and a correct chord cannot be assigned to the melody.
[0007]
Therefore, the present invention has been made in view of the above problems, and has as its object to provide a system and the like that can perform correct chording for a given melody with a small amount of calculation. is there.
[0008]
[Means for Solving the Problems]
That is, in order to solve the above-mentioned problem, the present invention receives an input of a melody and determines an approach note in a common chord area from the melody. Then, a chord is generated based on the constituent sounds excluding the determined approach note, integrated with the melody, and can be output as music data so as to be viewable.
[0009]
With this configuration, the chord is generated based on the constituent notes excluding the approach note, so that the generated chord volume can be reduced, and the chord corresponding to the melody is generated. Music data conforming to the above can be generated.
[0010]
Further, when the approach note is determined in this way, it may not be possible to determine the approach note only in an area (for example, one bar) where chords are common. In this case, first, a tentative approach note assumed from the given melody is determined, and a chord candidate generated based on the tentative approach note is generated. Then, it is determined whether or not the chord progression including the provisional chord candidate conforms to the chord progression stored in advance in the storage means. If it is determined that the chord progression does not match, the non-conforming chord progression is determined. Correct the interpretation of approach notes in the common chord region to which is assigned.
[0011]
As described above, the approach note that cannot be determined only in the common chord area is determined based on the preceding and following common chord areas, so that the approach note can be determined more reliably, and a chord suitable for the melody is generated. Will be able to do it.
[0012]
Further, when a chord is generated in this way, a plurality of chords are generated in a common chord region based on constituent sounds excluding the approach note, and the degree of consistency with the melody, that is, the approach note is derived from the melody. Chords are extracted in consideration of the degree of overlap between the excluded constituent sounds and the chord constituent sounds.
[0013]
With such a configuration, even when a plurality of chords can be generated in the common chord area, natural music data that is more suitable for the melody can be generated.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a music data generation system 1 according to the present embodiment includes a plurality of portable information terminals 2 configured by mobile phones and the like, and music data connected to the portable information terminals 2 via a network 4. For example, when generating a ringtone melody or a melody mail, the portable information terminal 2 accepts the input of a melody, and the music data generation device 3 uses the melody as an approach note based on the melody. The music data to which a chord is added is generated from the remaining constituent sounds by judging a passing sound, an impulsive sound, an embroidery sound, a mooring sound, a preceding sound, and a missed sound. Hereinafter, a specific configuration of the present embodiment will be described in detail.
[0015]
As shown in the block diagram on the left side of FIG. 2, the portable information terminal 2 transmits and receives data between an input receiving unit 20 that receives an input such as a melody and the music data generating device 3 via a network 4 such as the Internet. And a storage means 23 for storing various information such as music data transmitted from the music data generating apparatus 3 and an output means 24 for outputting music data. Do it. In addition, the portable information terminal 2 has other functions for fulfilling the original function of the portable information terminal 2, and has, for example, a necessary configuration for functioning as a normal telephone.
[0016]
The input receiving means 20 is configured by operation keys provided on the portable information terminal 2, an application for receiving an input of a melody, a music genre, and the like. The melody is received by the input receiving means 20 as individual pitch information or tone value information, and the music genre is received by allowing selection of a pre-registered music genre such as pop, jazz, or classic. . When the finally generated music data is transmitted to another person as a melody mail, the input receiving means 20 also receives transmission destination information such as the mail address of the other person.
[0017]
The transmission unit 21 transmits predetermined data to the music data generation device 3 via the network 4. For example, the melody, music genre, and mail of the portable information terminal 2 of the user are input via the input reception unit 20. It transmits destination information such as an address, model information of its own portable information terminal 2, and the like. The receiving means 22 receives music data and the like transmitted from the music data generating device 3.
[0018]
The storage means 23 stores information necessary for operating the portable information terminal 2, and as shown in FIG. 3, an execution program area 230, a music data storage area 231, a terminal information storage area 232, a work area 233 are provided and information corresponding to these is stored. Of these, an execution program for operating the portable information terminal 2 is stored in the execution program area 230, and specifically, a program corresponding to the flowchart shown in FIG. 5 is stored. The music data storage area 231 stores music data received from the music data generation device 3 together with identification information corresponding to the music data. Further, the terminal information storage area 232 stores identification information such as a mail address of the own terminal, model information of the own terminal, and the like.
[0019]
The output unit 24 includes a display output unit such as a display and an audio output unit such as a speaker. The output unit 24 displays and outputs the music data transmitted from the music data generation device 3 and outputs the music data as audio. The output means outputs the music data in a viewable manner. The display output and the audio output incorporate a program that outputs the data while synchronizing with each other, and for example, change the display mode in accordance with the progress of the melody or chord. When used as a ring tone melody, the music data is output in response to detection of a ring tone.
[0020]
On the other hand, the music data generating device 3 automatically generates chorded music data based on the melody transmitted from the portable information terminal 2, and has a music theory knowledge, accompaniment pattern, file format as shown in FIG. A storage means 30 for storing a program, etc., a microprocessor, and other devices, etc., a receiving means 31, a modality / key determination means 32, an approach note determination means 33, a chord generation means 34 as shown on the right side of FIG. , An accompaniment data generating means 35, an integrating means 36, a media data generating means 37, a transmitting means 38, and the like. The information stored in the storage unit 30 will be described later.
[0021]
The receiving means 31 is for receiving data transmitted from the portable information terminal 2 via the network 4, and transmits the melody, music genre, transmission destination information, model information, and music data when transmitting the music data as a melody mail. It receives destination information and the like and temporarily stores these data in the storage means 30.
[0022]
The melody / key determination means 32 determines the melody or key of the input melody, and specifically performs the following processing. That is, when determining a key, first, a key that includes a note name in the order in which the note name appears is extracted, and thereafter, key candidates are narrowed down each time a new note name appears. Then, the processing is performed up to the last sound, and if only one candidate key remains, the key is set as the melody is undecided. However, at this stage, since the mode is undecided, there is one key possibility for each of the long and short modes in the implementation. In this state, the mode is determined as follows. In other words, the deciding method is determined such that the last sound is the tonic. In other words, if the last note of the melody is "do" by "moving do", it is determined to be major, and if it is "ra", it is determined to be minor. In other cases, the frequency of appearance of each note name is determined, and the main tone is determined so that the frequency of appearance of the main tone, the belonging sound, and the subordinate sound increases. If no key candidates are found as a result of narrowing down the keys, it is checked whether key candidates remain by removing any one of the note names, and if there are, the key is set. Usually, in that case, it is a minor key, and the removed sound corresponds to a conduction sound (a semitone below the main sound). If there are still no key candidates, the frequency of appearance of the pitch names is checked, and a determination similar to the above-described melody determination is performed in combination with the key determination. In this case, the mode and the key are determined simultaneously. It is confirmed that the last note of the melody is a note in the main chord, and if no match is obtained, the next candidate and the like are sequentially examined. As a result of narrowing down the keys, if there are any candidates remaining, the frequency of appearance of the pitch names is checked, the candidates are narrowed down, and the modalities and keys are determined in the same manner as above.
[0023]
The approach note determining means 33 determines whether or not each constituent sound of the melody corresponds to the approach note for the melody whose melody and key have been determined. The approach note determining means 33 stores music theory knowledge information on approach notes in the storage means 30 in advance, and determines whether or not each constituent sound corresponds to an approach note in the common chord area based on this information. I do. More specifically, music theory knowledge information that can be determined as described below is stored in the storage unit 30, and an approach note is determined based on the information. Note that the following music theory knowledge information indicates a part of music theory knowledge information, and also stores a plurality of music theory knowledge information.
[0024]
(1) Judgment of elapsed sound
When three to five consecutive notes are present, if there are three consecutive notes following “Doremi” with “do” as the moving character, the second “レ” is determined as the elapsed sound.
[0025]
(2) Judgment of embroidery sound
If there are three sounds following “Dredo”, the second “D” is determined as the embroidery sound.
[0026]
(3) Judgment of bias
It is assumed that for two tones with a strong beat and a second interval (for example, when the first beat of a bar is “Red”), “Le” may be interpreted as a pel.
[0027]
(4) Judgment of missed sound
It is assumed that two sounds of the second interval following the jump progress (for example, “Sorere...”), One of “Do” and “Re” may be interpreted as a missed sound.
[0028]
(5) Judgment of mooring sound
In a certain common chord area, the sound that continues from the previous common chord area may be a chord constituent sound in the previous common chord area, and thus may be interpreted as a mooring tone in the common chord area. Suppose there is.
[0029]
(6) Determination of preceding sound
In a certain common chord area, a sound that continues to the next common chord area may be a chord component sound in the next common chord area. Suppose there is.
[0030]
In the above-mentioned approach note determination, all judgments of eccentric sound, missed sound, mooring sound and preceding sound are interpreted as "possible", but whether or not these sounds correspond to the approach note For the determination of the above, first, a list of combinations of interpretations of the approach note for the whole sound is enumerated, assuming that it is determined whether or not the note is an approach note. Then, an arbitrary one of the patterns is randomly or arbitrarily selected, and its interpretation is interpreted as a tentative approach note, and the chord generating means 34 described below determines the approach note together with the chord generation processing.
[0031]
The chord generation means 34 enumerates a plurality of chord candidate groups based on the constituent sounds of each melody excluding the constituent sounds interpreted as the tentative approach notes. The default of the common chord area is set to one measure, but the user can arbitrarily change this. For the chords that can be set for the common chord area, the names of the chords whose constituent sounds are sounds with a long absolute time are listed using the absolute length of the sound included in the area as an index. When generating the chord, it is determined based on the music genre transmitted from the portable information terminal 2 whether or not the chord candidate group is suitable.
[0032]
More specifically, when “Dore mifa” exists in a certain chord setting section, the approach note is interpreted as “Do” or “Mi” or “Re” or “Fa” as the approach note. Cannot be determined in the chord setting section. For this reason, interpretation (a) interprets "do" and "mi" as approach notes, and interpretation (b) interprets "re" and "fa" as approach notes. Is appropriate based on the chord candidates in the immediately preceding chord setting section. Based on the interpretation (a), "Le" and "Fa" are chord constituents, and a second minor (Dm in C major) which is composed of "Le Fara" is a chord candidate. . However, if V7 (G7 in C major) is set in the immediately preceding chord setting section, if the progression from V7 to Dm is not used in a certain music genre, Dm is not suitable as a chord candidate. That is, the interpretation (b) is adopted because it is incorrect to adopt the interpretation (a).
[0033]
The approach note thus determined as "possible" is determined using the chord progression of the music genre, and then a chord is generated using the determined approach note. Regarding the generation of this chord, the chord progression for each music genre used earlier is not used, but a chord corresponding to the melody of the common chord area is generated independently. Here, when generating a chord, a plurality of chords can be generated in the common chord area, but the chord is generated in consideration of the degree of consistency indicating the degree of commonality between the melody and each of the constituent tones of the chord.
[0034]
Then, any one of the chords allowed between the common chord regions is selected. The selection criterion follows the genre-specific statistics of the music database based on the second-order Markov model. That is, the partial chord progression that is used most frequently in a probabilistic manner is selected as the first candidate in consideration of the continuation state before and after each time. This use frequency is based on the music genre input by the user. In addition, the degree of matching determined earlier is also taken into account in the chord progression decision. If there are candidates below the next point in the order of appearance frequency in the database, up to about three candidates are retained, in case the user later requests another chord progression possibility. The reason for using the second-order Markov model is that the progress of the music is considered to depend on the progress of the chords before and after a certain point in time. However, the start chord is, in principle, the main chord, and if the first sound is a sound other than the main chord, it is determined that it is a grace tone. The second chord is determined based on the primary Markov model, and the third and subsequent chords are determined based on the secondary Markov model. The final chord attached to the last note of the melody should be the main chord, and the preceding chord should be the subordinate chord.
[0035]
The accompaniment data generating means 35 extracts accompaniment data such as drum sounds for the chord progression selected in this way. Since the accompaniment patterns have different characteristics depending on the music genres, the accompaniment patterns such as the drum sounds and rhythms of each music genre are stored in the storage means 30 and selectively used from among them.
[0036]
The integrating means 36 integrates the chords and accompaniments extracted in this way into a melody and combines them into one music data as a whole. Then, the music data is output to the media data generating means 37 so that the music data can be viewed on the portable information terminal 2 of the transmission source.
[0037]
The media data generating means 37 converts the music data into a file format in which the source portable information terminal 2 can output the music data. The storage unit 30 stores a file format that can be output for each portable information terminal 2, reads out the model information transmitted from the portable information terminal 2, and converts the format into a file format corresponding to the model information. I do.
[0038]
The transmitting means 38 transmits the music data generated in this way to the portable information terminal 2 of the transmission source via the network 4 and outputs it so that it can be viewed. When transmitting the music data to the third party portable information terminal 2 as a melody mail, the music data is transmitted to a mail address related to the transmission destination.
[0039]
Next, a music data generation flow in the music data generation system 1 configured as described above will be described with reference to FIGS.
[0040]
First, when a melody mail is transmitted to another person, as shown in the flow of the portable information terminal 2 in FIG. 5, a predetermined program is started on the portable information terminal 2 to input a melody or a music genre using operation keys or the like. The reception and the input of the mail address of the melody mail transmission destination are received (step S1). Then, on condition that a transmission instruction is input (step S2), the melody, the music genre, and the mail address of the transmission destination are transmitted. At this time, transmission destination information such as the mail address of the portable information terminal 2 is transmitted. And device information are read out and transmitted together (step S3).
[0041]
When the music data generating device 3 receives the information (step T1), first, the melody and key are determined based on the received melody (step T2). In determining the mode and key, first, a key including a note name in the order of appearance is extracted as a key tone, and thereafter, key candidates are narrowed down each time a new note name appears. Then, the processing is performed up to the last sound, and if only one candidate key remains, the key is set as the melody is undecided. However, at this stage, since the winding method is undecided, there is one possibility of tuning for each of the long and short winding methods. However, in this state, the winding method is determined as follows. In other words, the deciding method is determined such that the last sound is the tonic. In other words, if the last note of the melody is "do" by "moving do", it is determined to be major, and if it is "ra", it is determined to be minor. In other cases, the frequency of appearance of each note name is determined, and the main tone is determined so that the frequency of appearance of the main tone, the belonging sound, and the subordinate sound increases. If no key candidates are found as a result of narrowing down the keys, it is checked whether key candidates remain by removing any one of the note names, and if there are, the key is set. Usually, in that case, it is a minor key, and the removed sound corresponds to the lead sound (semitone below the tonic), but if there are still no key candidates, the frequency of appearance of the pitch names is checked, and the same determination as the above-described whirl determination Is performed in combination with the key determination. In this case, the mode and the key are determined simultaneously. It is confirmed that the last note of the melody is a note in the main chord, and if no match is obtained, the next candidate and the like are sequentially examined. As a result of narrowing down the keys, if there are any candidates remaining, the frequency of appearance of the pitch names is checked, the candidates are narrowed down, and the modalities and keys are determined in the same manner as above.
[0042]
Then, a chord generation process is performed on the melody whose melody and key have been determined in this way (step T3). In the chord generation process, first, as shown in FIG. 6, a melody approach note determination process is performed (step T30). In this approach note determination process, first, a chord candidate group is generated based on the approach note assumed to be the determined approach note (step T31). Then, it is determined whether or not the chord progression by the generated chord candidate group conforms to the chord progression of the selected music genre (Step T32). The assumed approach note in the chord area is corrected to determine the approach notes in all common chord areas (step T33). Next, when the approach notes of all the common chord areas are determined as described above, the approach notes are removed from the melody, and a chord is generated based on the remaining constituent tones (step T34). This chord is generated separately from the chord progression of the music genre, and when a plurality of chords are generated in the common chord area, a degree of consistency with the melody is given (step T35). Then, using this degree of consistency, one chord is selected according to the music genre-based statistics based on the secondary Markov model (step T36).
[0043]
Next, the accompaniment data added to the generated chords and the like are read from the storage means 30 (step T4). The extraction of the accompaniment data is performed by ascertaining the transmitted music genre and reading the accompaniment data corresponding to the music genre from the storage means 30.
[0044]
Then, the melody, chord, and performance pattern data are integrated to generate music data (step T5), and the music data is associated with the model information so that the music data can be viewed on the portable information terminal 2 of the transmission source. The data is converted into media data in a file format (step T6). Then, transmission of the converted music data together with the identification information corresponding to the music data is confirmed for transmission to the portable information terminal 2 (step T7). The identification information is stored in the storage means 30 (step T8).
[0045]
The portable information terminal 2 that has received the music data (step S4) outputs the music data for viewing (step S5), and if the user determines that the melody and the chord do not match, The input to that effect is permitted (step S6) and transmitted to the music data generating device 3 (step S7). At the time of this transmission, identification information corresponding to the previously assigned music data is transmitted.
[0046]
Based on this, the music data generation device 3 generates music data having a chord different from the chord of the music data corresponding to the identification information (steps T3 to T8). If the music data desired by the user is generated after repeating the viewing and correcting processes, the music data is transmitted as a melody mail to the portable information terminal 2 or the like of the third party (step T9).
[0047]
As described above, in the above embodiment, the approach note is first determined from the melody, and the chord is generated based on the constituent tones excluding the approach note, so that the chord can be generated with a small amount of calculation. In addition, it is possible to generate music data more appropriately adapted to the melody.
[0048]
Further, in this embodiment, when it is not possible to determine whether or not an approach note is present, first, an approach note is set in a tentative form to generate a chord candidate group. If it does not conform, the approach note interpretation of the common chord region that does not conform is corrected, so that the certainty of approach note judgment can be increased and a chord that is more suited to melody can be generated. Will be able to
[0049]
Further, based on the approach note thus corrected, a plurality of chords in the common chord area are generated, and in addition, chords in consideration of the characteristics of the music genre are generated. Optimum music data can be generated in consideration of chord settings (vertical chord settings) and chord settings based on chord progression (horizontal chord settings).
[0050]
It should be noted that the present invention is not limited to the above embodiment, but can be variously modified.
[0051]
For example, in the above-described embodiment, the music data generation system 1 including the portable information terminal 2 and the music data generation device 3 has been described. However, the present invention is not limited to this, and a single device can be used to input melody and generate chords. Processing may be performed. In this case, the “system” in the present invention is interpreted as a single device. Further, the device in this case is not limited to a mobile phone or a personal computer, but can be applied to an electronic piano or the like.
[0052]
Further, in the above-described embodiment, a case has been described in which a ring tone melody, a melody mail, and the like are generated.
[0053]
Furthermore, in the above embodiment, when a chord is generated, the melody and key are determined first. However, when the melody is input, the user may determine the melody or key in advance and then input the melody. Alternatively, the melody and key may be determined by default, and the input of the melody may be received in this state.
[0054]
In addition, when generating a chord, a plurality of chords are generated based on the finally determined approach note, and a chord according to the music genre is generated from the secondary Markov model, but is not limited to this. Alternatively, a chord with the highest matching degree may be extracted from a plurality of chords generated in the common chord area.
[0055]
【The invention's effect】
In the present invention, an approach note is determined from an input melody, and a chord is generated from constituent sounds excluding the approach note, so that a chord can be generated with a small amount of calculation, and the melody can be adapted. Can be generated.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a music data generation system according to an embodiment.
FIG. 2 is a functional block diagram of the music data generation system according to the embodiment;
FIG. 3 is a memory map showing information stored in a storage unit of the portable information terminal.
FIG. 4 is a memory map showing information stored in a storage unit of the music data generation device.
FIG. 5 is a flowchart of the music data generation system according to the embodiment.
FIG. 6 is a detailed flowchart of a chord generation process in FIG. 5;
[Explanation of symbols]
1. Music data generation system
2 ・ ・ ・ Portable information terminal
3. Music data generator
20 ... input receiving means
24 output means
33 ... Approach note determination means
34 chord generating means
36 ・ ・ ・ Integration means

Claims (7)

A music data generating system comprising: an information terminal having input receiving means for receiving an input of a melody; and a music data generating device for generating music data with chords based on the melody input at the information terminal. The data generator is
An approach note determining means for determining an approach note in a common chord region from a given melody,
A chord generating means for generating a chord in the common chord region based on the constituent tones excluding the determined approach note;
Integrating means for integrating the generated chord and the melody;
Output means for outputting the integrated music data;
A music data generation system comprising: In a music data generation device that generates music data with chords based on an input melody,
An approach note determining means for determining an approach note in a common chord region from a given melody,
A chord generating means for generating a chord in the common chord region based on the constituent tones excluding the determined approach note;
Integrating means for integrating the generated chord and the melody;
Output means for outputting the integrated music data;
A music data generating device comprising: The approach note determining means determines a provisional approach note from a given melody to generate a provisional chord candidate, and a chord progression including the provisional chord candidate is stored in a chord stored in advance in a storage means. 3. The music data generation device according to claim 2, wherein, when the chord progression is not adapted, the interpretation of the tentative approach note in the common chord region not adapted to the chord progression is corrected. A chord generating means for generating a plurality of chord candidates in a common chord region based on the constituent notes excluding the approach note determined by the approach note determining means, and selecting a chord from the plurality of chord candidates in consideration of the degree of consistency with the melody 4. The music data generating device according to claim 3, wherein the music data generating device extracts music data. A music data generation method for generating chorded music data based on an input melody,
Determining an approach note from a given melody;
Generating a chord in the common chord area based on the constituent sounds excluding the determined approach note;
Integrating the generated chord and the melody;
Outputting the integrated music data;
A music data generation method, comprising: Determining the approach note includes determining a provisional approach note from a given melody and generating a chord candidate based on the provisional approach note; and including the generated provisional chord candidate. A step of determining whether or not the chord progression matches the chord progression stored in advance in the storage means; and if it is determined that the chord progression does not match the chord progression based on the determination result, the chord progression is not matched 6. The music data generation method according to claim 5, further comprising: correcting the interpretation of the tentative approach note in the common chord area. The step of generating a chord includes generating a plurality of chords in a common chord region based on the constituent notes excluding the approach note determined in the approach note determination step, and considering the degree of consistency with the melody from among the plurality of chords. 7. The music data generating method according to claim 6, wherein the music data is extracted.

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