The ATP-organized Don't Look Back gigs feature "classic albums" performed in their entirety by all-original lineups: Step forward, Dinosaur Jr., Mudhoney, and the Lemonheads. It's an idea that smacks of selling out and dumbing down, a pipe-and-slippers rock show for aging grungesters who no longer like surprises. Yet it's also willfully perverse, harking back to a time when track listings embedded themselves in our brains. The hop, skip, and jump iPod generation won't have a clue.