@adodd81802 Regarding your question about Gaspard, I think it's gotten a bad rap from pianists the world over mainly for its awkward passages involving juxtaposition of the hands in certain passages, leaps while crossing one hand over the other, and for prerequisites such as extremely fine and ethereal tonal shading and aural craftsmanship required to pull it off convicingly. I've never played it myself- but having browsed through it a few times in the past, it seems like a piece of cake to me- can't understand why it's considered to be so difficult - might be a question of endurance more than speed, idk.
'Islamey', however, is a totally different story- it has a reputation of being one of the most notoriously difficult things ever written for the piano (at least in the standard repertoire)- and possibly with good reason. It's my impression that it's actually more treacherous than difficult, and has gotten a bad rap because pianists most probably approach it in an amateurish and tecnically inefficient manner. It's also a piece that i've never played either, but I can vouch for the awkwardness of the writing, and the chromatic descending octaves in the right hand, together with the leaps in the left hand in the development part preceeding the 'trepak' are no doubt, at least a slight challenge to master. I also tend to think that the huge quantity of accidentals and chromaticisms in the piece daunts and confuses pianists. Having said that, I think its difficulty lies much more in conveying the spirit of the piece- which, according to one of my piano professors, was inspired in pantheism- and maintaining this spirit throughout while not faltering in tempo or impetus- that is almost certainly a challenge. If you want to learn it, I recommend first learning it very slowly, then gradually speeding up the parts I just mentioned, before trying to tackle it as a whole and as a musical composition. And I don't recommend it being tackled by anyone under 20 years old, or without a professional-level technique! All this being said, I assure you that it isn't anywhere even NEARLY as difficult as the Revolutionary etude in octaves, or even Op.10,#2 in 60 seconds, for that matter- playing the Rev. in octaves is a feat of singular technical complexity, which I don't advise ANYONE, even a top, world-class pianist, of attempting to duplicate. There have been famous pianists in the 20th century who have permanently injured their hands playing stuff much easier than that.