I have an HipHop Ejay 5 and Sound Selection #4 (5000 samples in 4 CDs) for sale. You can get older Ejays really cheap on eBay and those are most easiest soft for a making music. Literally you can make your first piece in just a few hours.

You can download some of my songs on Newgrounds.com
On Newgrounds you can easily find a song for your game by genre.

Another great website that offers free full length albums in Jamendo.com .
You can find some albums that are free for commercial use.

Also if you have a low budget you can simply get some free VST or SoundBanks and grab LMMS