There's going to be a rash of guitar-rock bands in the next decade. Look at all of these shows with the coolest characters playing in rock bands and Andre 3000's neo-Fat Albert cartoon, ''Class of 3000.'' 'Three chords and a Stratocaster' is being implanted into millions of teens' collective unconscious. Not to mention that Guitar Hero II has players mastering songs by Kiss, Matthew Sweet, Cheap Trick and ''Sticky Finger''-era Rolling Stones. And also Wolfmother. (The record store clerk came back to the phone when I asked him to check if they had Richard Butler's CD. He asked me if I had said, ''Wolfmother?'') And for the kids currently being forced to take piano lessons, Rufus Wainwright may overtake Randy Newman's monopoly of family-feature soundtrack songs. (He has three songs in ''Meet the Robinsons.'') His aria duets with David Byrne show that reedy voices can combine to sound as nice as Joan Southerland on a rock album.