"Theres only one thing to do in a situation like this.....Strut".
(followed by the stayin alive music)
Not really rock, but its funny
"This is a rock concert, not the bleedin splish splash show..."
"We are very big in Bulgaria, and that other Garia...."
"Hungaria"
"Thats it".
"You know, people think theres only 4 members of Spinal Tap, but they are wrong..................................................Hello????? Thats the cue for you to turn the house lights on so we can tell the crowd they are the fifth member of the freakin group".
"Goodnight Springton, there will be no encore....."
All from the mighty spinal tap of course
"No, NO, dont stop a rockin!!!" From homer.
Thats about all the rock quotes I can think of from the simpsons at the moment. Ahh this thread was good for a laugh, the simpsons rule