NoBar, a rock 'n' roll lounge on Magnolia Boulevard with a 28-foot bar backed by mirrored glass in vibrant colors, replaces a lesbian bar that was open for 20 years on a block filled with recording studios, an actor's playhouse, a hair salon and a furniture store. Part of the NoHo Arts District, the 1,200-square-foot NoBar features a jukebox, pool table and will eventually add an outside patio.