So I gave in and am going to use royalty free music available on the internet for Poocakes. A great source, which we used entirely for Brain Freeze, is Incompetech.com (run by Kevin MacLeod). So if you liked Brain Freeze, I suggest sending some donations in his direction.
Some other sites offering royalty free music, referred to from that site, are jmtr.com and jimmyg.us. I'm yet to check them out (will be shortly), but I'm sure they're equally awesome.
That being said, you'll probably be able to tell the difference between the music I wrote and the music we borrowed, but you'll be able to check out which songs were written specifically by MacLeod in the credits section of Poocakes.