Sold-out concerts, screaming fans, TV shows, Number Ones. This is the rock and roll dream, and the Wonderkids are living it. But something's wrong. The gigs are sold out, sure, but the halls are packed with little kids--not sexy hipsters. And that screaming? It sounds more wailing, actually. The TV appearances are PBS on Saturday morning, rather than Saturday Night Live, and as for Number Ones . . . you don't want to know. Exposed in his impressionable...