Two counter culture youth icons. One has 100m members. The other 82m viewers. The first is transforming the online promotion of music, and just got a fat $900m revenue guarantee from Google. The other established video as the ultimate vehicle for music promotion, and even after a quarter century, continues to seduce big brand advertisers. In the showdown between MySpace and MTV, its tempting to call the round on the numbers. But there is a more interesting comparison to be made.