Gamo, if you're interested in Jack Johnson, you should watch the 4 hour documentary that was made about him a few years ago by Ken Burns.

Here's the youtube link to the first part of the movie. It's divided into about 30 parts because it's a long documentary, but there's one guy who has the whole thing on youtube.

http://www.youtube.com/watch?v=MUo9gIp3cRg