Last week I stopped by a noon rehearsal at the black box theater at Charlottesville High School, where the city has allowed Ash Lawn Opera to rehearse before its festival begins this month. The cast of The Barber of Seville, which opens at The Paramount Theater on July 15, wandered through the hallway, past dusty trophies and a fearsome, handpainted Black Knight (the school’s mascot). The show’s director took the stage and started whipping instructions around. A piano tinkled in, and a fight scene began to unfold; puff-chested soldiers singing “eEeEeEeEe” grappled, swinging the kind of bludgeons favored by Bamm-Bamm Rubble.