Welcome to the Musician's Jam, my first ever game jam. I am a musician so this jam will intrigue me to see everyone's music skills.
The jam is easy; make a game about music. Now, I'm not supposed to give examples or ideas pre-jam, but some helpful advise:
A Guitar Hero-esque game, a Geometry Dash-esque game, a game with amazing or beautiful music, etc.
With that said, good luck to all my fellow musicians, and rock on.