Once upon a time, theatrical British goth-rock greats the Sisters Of Mercy were a big-time touring act in the United States. In 1991, the year of the first Lollapalooza tour, the Sisters headlined their own alt-rock package tour; it also featured Public Enemy, Gang Of Four, Warrior Soul, and Young Black Teenagers. In recent years, the Sisters Of Mercy have only been intermittently active. They haven’t released any new music since their 1993 LP Vision Thing, and they haven’t toured the US in about 15 years. This summer, however, the band will hit the road in America.