Cheers announce J, Lou and Murph approaching the stage. They resemble the picture in Our Band Could Be Your Life. They are Dinosaur Jr. J slides like a newborn snail on a predetermined track, wispy strands of a silvery mane undulating with each slinking step. He removes his horn-rimmed glasses, lifts a Fender Jaguar from its stand and delicately summons a jangly wail from it.