There was a rock song that had 20-30 bands all playing the same song in what looks to be a high school gym. As the video goes on some parts only have all the drummer in the scene all doing the same drum solo, another scene as all the singers, another scene had all the bands playing together...
I think the bands themselves are all garage bands that won a contest to be in this video and play the same song all together with the actual band that whos song it is.
Name that tune?!??