I'm a musician, I play music and I write songs too. But I'm not used to make single-melody songs. It's very hard to make a song for a game, when you're used to make songs with a lot of instruments (or at least songs with more then one tone on a time).
I think it's hard to find musicians in here, because I think the people who write their own songs (like me) use them in their own games too (like me).
But wasn't their a thread of somebody who said he liked to make songs for people around here? His name was John Bock.