Girls Aloud's music videos are a master class in transforming big dance-pop tunes into small-screen spectacles. The clip for the drum 'n' bass-driven “Sound of the Underground” highlights the group's girl-next-door sass, and “Biology” riffs on old-timey choreography while packing in plenty of evening-wear costume changes. The macabre visuals of “Sexy! No No No...” show that Girls can do a lot more than just sweet and sensual.