[One Winged Angel]

haven't tried playing black key etude but I looked up the sheet music for mephisto waltz a while back...there's some pretty nasty chord chromaticism and ring/pinky trilling which makes me inclined to believe it's the more difficult piece...and some of the arpeggiated sections are really difficult to finger

based just on listening, I really don't think black key etude would be all that difficult but eh