Some people are not satisfied with one (real) life and create a (virtual) Second Life.
But real life is more and more intruding in the virtual world.
People are making money in it buying/selling virtual land or property - Anshe Chung became the first SL millionair - and companies are exploring the possibilities of product marketing and job recruiting in Second Life.
Virtual political riots have taken place and even an bomb attack.
Musicians like AIR, Jay-Z and Suzanne Vega performed for a public of avatars.
Paradiso, the concert hall in Amsterdam, The Netherlands, publishes video recordings of live concerts at fabchannel.com.
At video.google.com you can find lots of concert videos and video clips too, including historical footage of Woodstock and The Beatles for example.
If you are a jazz fan you should check out Jazz Tube.