At the concert the main character's brother is conducting the 2nd movement Haydn's Symphony No 94, the Surprise. It features one loud note - a wake up note - to rouse the possibily sleeping audience, but also as a way of poking fun at the overly pretentious listeners. This fits exactly with one theme of this movie where they are poking fun at the pretentious nature of modern artists who believe everything they make is significant.