Wow, this is exactly what I have been looking for when making previous applications/games. It is very smart of you to turn to a developer community, because I know many people are or have been in my shoes (been able to produce games, but lack an important aspect; music).
I am just curious, but what are your thoughts on payment and such? People who develop for i.e. iphone or Android, do seldom know if their game will be a hit and so on. So, what do you charge for your services?