BIOLOGY
by GIRLS ALOUD

Girls Aloud's most experimental single dares to look at the standard ABBA structure of a pop song - verse, chorus, verse, bridge, chorus - and think...we can do better than that.

The creative zenith of Cheryl, Nadina, Nicola, Sarah and Kimberley's daring partnership with Xenomania, Biology is as bonkers as it is brilliant; stitching together three completely different songs into one cohesive whole. 

For a band determined not to play by any other's rule apart from their own, it's fitting that Biology races through a stack of slick melodies and hooks before finally arriving at the chorus 2 minutes in.