For some, it's becoming quite fashionable to throw short promo videos on sites like Youtube, with some shots in a slide show, sometimes mixed with video as "the making of".
It's always tricky to find accompanying sound/music, and most is probably just used improperly. As a microstocker especially, it's not OK to do so, and looking for RF music I found
Kevin McLeod on his site
incompetech.com that offers hundreds of very usable loops and background music pieces for
free (with a CC attribution license). He has an amazing collection of moods and genres for every video type, from muzak to stings to short compositions.
YouTube
Attention YouTube: All use of music from my site is legal for use on YouTube with any attribution at all. People's credits formats have a wide variety, and ANY credit for my music is acceptable.
What about the YouTube partner program?
Yes. Please use my music to make money on YouTube. Just make sure my name is either in the credits of the piece or in the "more info" section associated with your video. Simple, simple.
What about commercial use for a [whatever]?
Yes! Please do use my music in your commercial project.
I used one of his tracks in this (free account) Animoto generated video (but I'm redoing it at the moment with Microsoft Moviemaker):
[youtube]http://www.youtube.com/watch?v=34_fl06w9BM[/youtube]