This new live album from post-rock darlings Mogwai might sound better than their studio records. The effects-laden guitar melodies tower a bit higher, but the inevitable crash of drums and strums is more deafening than ever.Special Movesis a collection of great songs spanning the band’s entire career, accompanied by a DVD of gorgeous, black-and-white footage from a performance in Brooklyn. For the uninitiated, live albums don’t normally act as good introductions. In this case, one could make an exception.