It has been suggested that nostalgia tends to run on 15- to 20-year cycles. If that's the case, then the Los Angeles alternative rock outfit Operator are right on schedule, because their blend of booming, full-throated vocals and punk- and metal-influenced guitar riffs calls back strongly to the grunge rock sound of 1992, when Soundgarden and Pearl Jam were first hitting the musical mainstream. Operator began as a solo project by singer, songwriter, and multi-instrumentalist Johnny Strong, who along with those pursuits is also a stuntman, competitive fighter, and occasional ac...