I did not know where to put this. Perhaps we need to add a video section.

Is there a good place to find inexpensive royalty-free or public domain background music for videos?

I know that most people just violate copyrights and use any music that they can find, but I plan to produce videos for other companies and need background music and bumper music that I use without potential problems with copyrights.

Most of the sites that I have looked at were either too expensive or the "royalty-free" nature of their sound files was questionable.

I need a source that wither sells collections or offers individual sound files similar to the way that iStockPhoto works for images.