As a (still hobby) musician for decades, I'm astonished how many people think, music isn't such a big deal, esp. for a game
I mean, honestly, would anyone say "I have Photoshop, so who needs Michelangelo, van Gogh, and the like"?
Music is an art just like any other art out there! It has rules, just like any other art out there (ever heard of thirds and fourths and fifths, blue notes and intervals, cadences and harmonics, triplets and allegro, let's not forget the very technical and sometimes annoying post production...ok, I'll stop here). It's a mixture of talent and hard work, just like any other art out there.
When you use a program that is able to play looping audio files, how can anyone think he/she is composing music? I can buy me a paint-by-number kit and create it. Does that make me a paint artist?
Instead of a bad diy-soundtrack, that won't help your game building atmosphere, you should definitely find someone who's a bit more advanced. Wherever game developer gather, you will also find musicians. And just like game developer must earn their credits, musicians must too. You will always find talented musicians, who haven't build up enough reputation yet and so are willing to enter such projects to enhance their own portfolio. Raise your voice by posting in forums, or have a closer look at offers in such forums (here on Scirra you will make a find for sure).
For really tough professionals, that offer a real orchestration, a full professional recording studio and the like, don't be surprised to pay a few thousand per track. In general, as a rule of thumb, calculate between 10-50 per hour of work. But that depends on the level of professionality, that you can easily find out by listening to their portfolios.
But again, I'm sure you'll find more than enough really good musicians, who won't charge for it, if they can build up their rep.