There's lots of stuff that's not copyright. There's bands that use p2p to promote & spread their music. There's photographers who do the same & share similar. And for some other material, there's http://www.magnetmix.com/ / http://www.magnetmix.com/video.shtml & some others I can't think of the name of at the moment.
BTW I share some of my previous bands' music & I know of others who do the same.