Rock Box is a lounge and private-booth karaoke place on Capitol Hill. The interior feels swanky, with vibrant underlighting here and there, but mainly the decor stays spare, with contemporary, tidy furnishings. Clever technology in one room adjusts to your grandstanding preferences—you can control a window's opacity and choose whether to project your song onto the sidewalk. There's also one very tiny room, for when you feel like being all alone (the bartender says it's pretty popular). Hot and cold snacks along the lines of Japanese izakaya are available to go with your cocktails, but the latter might be a bit weak. Hint: Go during happy hour to avoid a rather staggering bill.