What do you do after you've reinvented a genre? Well, going on Graduation, the third full-length artist album by hip-hop's most famous Noughties auteur Kanye West, you hunt across the pop landscape for fresh sounds ripe for plunder. Most obviously, there's Daft Punk, whose track "Harder, Better, Faster, Stronger" forms the vocoder foundation to "Stronger". But Kanye's learnt more from the ...