Youtube is one of the greatest things on the internet - you can find true videos of even the most obscure things. For music, some of my favorites are:
New-to-me Nina Hagen. Some of her music is fabulous, much is awful. This was the first I saw of her, fascinating and strange:
http://www.youtube.com/watch?v=9xi4O4RvlnQ
Then there are versions of well known songs like this:
http://www.youtube.com/watch?v=lCCKy34MJqY&list=PLFC5AC5E6E1C07AB0&index=11&feature=plpp_video
I could go on, but I'll make myself stop.