hardest songs to play BY instrument

[SpaceBoy]

Bass- I'm kind of suprised a few people have said Gone, as I've always been able to play it with relative ease. It's probably because I only play bass, though. Mofo would probably be the hardest one to attempt, but I never play the actual main bass part as it's done with a synthesizer, so it's almost impossible to play at the same speed. Adam actually plays alot of fairly tricky stuff on October and War, because he bounces so many of the notes up and down octaves and uses alot of slapping and popping. The album version of Please is tricky too.