What Other Rock Musicals Should Glee Take On?

The much-awaited Rocky Horror episode of Glee airs tonight (yay!), but will it start a trend of one-show theme episodes? If so, what should Ryan Murphy and the gang tackle next? Will they go from hairography to just Hair? Will they grapple more weighty social issues in a Rent-themed episode? Can they teach Puck to play a mean pinball for Tommy? Or does the whole idea of the Glee rock musical really drive you insa-a-a-a-a-ane?