Hello,
I am sorry that you are having trouble with your code. But if you want to get help, you should simplify your code to the simplest thing possible that demonstrates the problem, and tell us exactly what it does wrong. With a little experimentation, you should be able to give us a 3- or 4-line program that does not work the way it should, and that will make it much easier to see the problem.
Alternatively, if you started with an example project, you could start over and see if you can find out exactly which change causes the problem. If you can tell us that making a single small change causes something to break, it should be easy to figure out.
By the way, did your 3pi play music with an unmodified demo program?
-Paul