It is about a music school in Philadelphia, The Paul Green School of Rock Music, run by Paul Green that teaches kids ages 9 to 17 how to play rock music and be rock stars. Paul Green teaches his students how to play music such as Black Sabbath and Frank Zappa better than anyone expects them to by using a unique style of teaching that includes getting very angry and acting childish.
This movie is totally hilarious! Jack Black is great for the part, and all the kids in the class are great! It is about this rocker dude that is dirt poor and lives with his best friend in his appartment, and his best friend's job is to be a substitute teacher for kid's teachers that are sick. Jack Black plays the rocker dude. So one day he answers his friend's phone, and there is this school teacher that broke like both her legs and arms falling in the bathroom, and they need a substitute for the rest of the year or at least several months. So the rocker dude [I forgot his name...] pretends to be his friend the substitute, and he teaches these kids - he teaches them rock and roll music. So they form this band and everything and they have to sneak out of the school to get to a concert and everything. And, of course, there's the problems... everyone finds out, his best friend wants to dump him out of his appartment, blah blah blah. It was a great movie...really hilarious! :-]