WooHoo!! I have gotten permission to use two .OGG music files from the site below for free (as long as I keep my game free):

http://www.imphenzia.com/soundtrack/

So now my game uses SDL_Mixer to do the sounds, AND it now has the two .OGG tracks as background music...pretty sweet I think, in my opinion :)

Hopefully I will have a new download for you all very soon to show off the background music!