For anyone who got the version of the link that doesn't work, this one should: http://www.youtube.com/watch?v=YBlCtqsat-w
I was alerted to the Back Dorm Boys by Rebecca Mackinnon, who lectures in journalism at Hong Kong University, and who uses the Back Dorm Boys to illustrate the fact that the internet is being used primarily for fun in China as everywhere else. Youtube was recently blocked here, but has been unblocked.