well. it's not entirely toooo difficult. i mean. he's seemingly random, and his speed is phenomenal, But when buckethead actually plays it, he uses a killswitch (actually i think it's a button) on the guitar to cut the signal to the amp.
thats where the into comes from. so it's basically just one chord with a pattern of kills, and then a couple scale notes..
But on guitar hero 2 it's a pain in the bitch.
i never got past 64% on expert