The Songs Package (for LaTeX) Code (Git)

Hello Mr. Hamlen,
First, let me thank you for creating such a powerful songbook typesetting package! The attention to detail is incredible!

Anyway, for my own songbook (https://gitlab.com/vitSkalicky/zpevnik-tex/ not publicly accessible yet) I need to add verses with custom labels, such as "bridge:" or similar. This feature was not available in this package so I added it myself. Even though I tried to add it in a simple way, I'm not a TeX expert, so it's not as clean as I would like it to be. Please improve it if you think it's not good enough.

Originally, I wanted to add an optional argument to \beginverse*, but I could not figure out how to do it without breaking existing songbooks. So I added a new command \labeledverse which behaves like \beginverse*, but takes one argument - the custom label.

Best regards,
Vít Skalický