This is my take: I just started recently paying special attention to actually playing piano (I'm also new to the forum)... Before, I'd spent all of my time making things up. I realized that before you can properly write down what you want, it's easier if you know everything available to you. Anyway, currently I'm working on only two pieces: a Chopin Etude (Opus ten, #4) and the Waldstein Sonata by Beethoven. I've actually only gotten the third movement (I'm working through backwards for no particular reason), and really, the Waldstein just has the trills to take care of... everything else is really an afterthought. However, after looking closely at all of the Chopin etudes, yes. They are all pretty darn difficult. However, the problem with the Etudes is they were WRITTEN to perfect certain techniques and experiment with ideas. Case in point: Opus twelve, number six: It's brutally hard until you perfect double trills and fingering, and then there's nothing to it. Also with Opus twelve, number ten: work up your arm strength and your octave technique, and you have nothing to worry about. So I don't think you can actually call them the most difficult pieces, because once they're learned, it's done. The monsters are the ones that are just as hard to play every time as they were to learn, the ones that are still hard even when you know them front to back. In that sense, the Songs without Words (and Mozart pieces too) can be hard, because you must always pay attention to the emotion and character of the piece. In this sense, I actually (feel free to yell at me) believe the Chopin ballades to be extremely advanced peieces. If you take, for instance, number two, just listen to the emotion and tragedy. It's baffling, and anyone younger than the age of puberty can't even understand the depth of emotions and feelings in a piece like that. In addition, many of them DO utilize techniques refined in Chopin's etudes. I could listen to those till' I gathered dust, and never get tired. Of course, then ther are Lizst etudes (Campanella and Mazeppa come readily to mind) that are, frankly, immpossible at first site. Still, like the Chopins, there's more to "difficulty" than mere technical elments. Any thoughts?