You can use any of the following royalty-free music for commercial purposes in your videos:
http://incompetech.com/m/c/royalty-free/
http://machinimasound.com
http://www.entropymusic.com
http://www.stockmusic.net
http://www.musicbakery.com
http://www.neosounds.com
http://www.royaltyfreemusic.com
http://www.music4yourvids.co.uk/pages/indexpag.html
http://danosongs.com