There's a lot of confusion here, partly because of confusion over units of measurement. The original question "how many amps per hour" asks for something that makes no sense. "amps" is not a quantity, it is a rate. Thus "amps per hour" is an acceleration. I know, "huh?"
Into the bargain, playing music does not lend itself easily to figuring out how much power (in terms of battery capacity, for instance) will be consumed. The reason is that not only does the answer depend on how loud the music is, it also depends on what kind of music, and will vary from second to second as the music plays because of both the very nature of music in general. Thus it is not amenable to simple calculation.
In purely practical terms, the only way for the OP to get his question answered satisfactorily is to see how long his battery lasts with whatever set up he has, then if necessary, add capacity to the system. If he can't get enough solar power to do the necessary recharge, then more is needed.
