WHEN IT COMES TO JAPANESE POP,

U2 and the Rolling Stones have played concerts at the giant Tokyo Dome recently, but the biggest pop music band in Japan right now is Glay.

Glay, a pretty-boy rock group with slick guitars and harmonies, has a new greatest-hits album projected to sell 4.5 million copies.

On trendy Takeshita Street, where Tokyo’s hipsters and teenyboppers shop for used American jeans and eat at Burger King, Glay gets ...