The gradual shift in musical sensibility for Arctic Monkeys (due at 1STBANK Center with the Black Keys on Monday and Tuesday) can be traced through the guys' aesthetic: They wear sunglasses a lot now. They wear them in music videos and on stage, and sometimes when it's not really sunny enough to merit protecting their corneas. As their urban grit has widened into blatant, raucous rock and roll, boots have slowly replaced sneakers. They wear black now, and their pants are tighter. So are their riffs and rhythms, if not, perhaps, their accents. As bassist Nick O'Malley mentions below, the world has grown a lot larger than Sheffield in the past six years.