If you're in the mood for beautiful instrumentation juxtaposed against a backdrop of noise, Mogwai plays Regency Ballroom this week. The five-piece adopts a classical approach to composing its particular brand of instrumental post-rock, repeating recognizable phrases but altering each slightly. The band toys with crescendos almost purely for the sake of noise and volume, illustrating a mastery of loud-quiet-loud dynamics. On tracks like "I'm Jim Morrison, I'm Dead," the slow, unsettling melody builds over droning notes, producing an emotional landscape that peaks with crashing drums and distorted guitars. Like your nerves, melodies are left unresolved until the very end.