The Liszt transcription of BWV 543 is well worth playing. One of my all time favorite pieces!
I second this. The Liszt version of BWV 543 is magnificent. Currently relearning this piece. I also really suggest digging into some more transcriptions of Bach. There are just so many good ones out there.
Never done the Bach transcriptions of sorts, but I will look into it! Beethoven's Waldstein is very appealing, the Appassionata was certainly very enjoyable to learn and play. I also looked into Op.90, which I love (also a lot more doable). I would love more suggestions, famous or obscure! (Just not Fur Elise famous
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Op.90 is very nice. The Waldstein, to me, is my absolute favorite piece by Beethoven, perhaps of all, to play. I like it even more than the Appassionata. I really enjoy listening to the piece, but playing it is just so much fun. I keep returning to it after years even and picking up again (although I never really forget it). Much of Beethoven is like this for me, but the Waldstein is really just great fun, the whole thing.
In terms of other options (mostly played less often than big Beethoven and Chopin pieces), if I aim for pieces that are on the harder side and not short, but also less than 20 minutes, I think of the following:
Rachmaninoff - Corelli Variations Op.42
Franck - Prelude, Choral, et Fugue FWV 21
Faure - Theme and Variations Op.73
Grieg - Ballade Op.24
Prokofiev - Sonata No.4 Op.29 (I really love this one)
Liszt - Two Legends S.175 (both are amazing)
Janacek - 1.X.1905 Sonata
Godowsky - Passacaglia (ungodly difficult)
Szymanowsky - Variations Op.10 (Zimerman just recorded these)
Just some pieces I have recently learned or am hoping to learn soon. Perhaps they will also pique your interest.
-KC