Hi! I asked about that to my friend.
He used Ableton Live , Massive, and sound samples from Splice.
He recommended using Splice loop samples for instant making music.
Thanks a lot for the return, much appreciated! The music is also an important aspect of our submission, though certainly not as much as with your rhythm game. ;) We ended up using premade songs available from Pixabay, but in a future jam or project, we want to start looking at making our own music. The info you gave us will certainly help. Thanks again! :)