There is a full moon out here tonight, and it belongs to Angus Young, the twenty-one-year-old guitarist for Australian jock-rockers AC/DC. While his older brother and rhythm guitarist Malcolm, bassist Cliff Williams and drummer Phil Rudd hammer away on a locomotive number called "Bad Boy Boogie" for 6100 raving fans in the barnlike Milwaukee Auditorium, the diminutive Young — dressed in a green-velvet school uniform complete with blazer, shorts and beanie — puts his guitar down after an ear-razing solo and starts his nightly striptease.

The jacket goes first, then the striped tie and, finally, a white shirt soaked through with perspiration. As sweat continues to pour off his five-foot-and-then-some frame, Angus struts like a rooster across the stage, pointing to his crotch with a lewd, toothy smile. The crowd screams with delight, as if to say, yes, we want it all off. So Angus jumps up on Rudd's drum riser, turns his back to the crowd, bends over and drops his drawers. A split second of bared bottom later, Angus grabs his guitar and is off on another wild solo, as the teenage mob pressed against the stage roars its approval.

And that's only three songs into the show. Before this ninety-minute sweatfest is over, singer Brian Johnson howls his way through most of the songs on AC/DC's latest best-selling salvo, Back in Black, while Angus rides around the hall on the shoulders of a roadie, flailing away on his cordless guitar and, for his big finish, leaping off a six-foot-high speaker cabinet. During the encore, everyone gets into the act for "T.N.T.," shouting "Hoy!" in a Nuremberg-style sing-along.

"Milwaukee," barks Johnson at the end of the show, with a voice that could curl chest hairs at twenty paces, "you're fucking brilliant!"

The audience returns the compliment by buying enough AC/DC T-shirts, jerseys, caps and tour programs at the Milwaukee Auditorium concession stands to set a new house record.