I love this piece! I learned it with the intention of performing it a while ago but the performance never happened.I love (late) Franck's harmonic language. If I recall correctly he was inspired by/involved with a french music theory movement that advocated chromatic voice leading that could take you to some interesting places harmonically while still staying strictly tonal and it shows in his writing I think.It sometimes shows in the writing that Franck had huge hands. He asks you to play rather large intervals, which you can of course roll/break, but it's still kind of funny giw he writes all these huge chords without comment.The sections I had the most trouble with were the transitional buildup between the chorale and the fugue, and the climax of the fugue before the key signature changes to major. It took an unusually long time for me to memorize these parts, especially where my hands needed to go, because you are moving around quite a lot, and I would get in trouble if I had any kind of hesitation around where my hands needed to go next. Plus I think it's fair to say that that climax is just kinda difficult.The arpeggio sections in the chorale are theoretically easy, but I discovered that if I was even a tiny bit worried about missing the top note of the arpeggio where you cross hands I would inevitably miss a lot of them So easy in theory and hard if you are worried about messing up I guess?Oh and you have to listen to my favorite recording of the piece, it's just fabulous:
I've learned this piece years ago and it's very difficult. Franck may be a romantic composer but he's not an easily likeable composer like Schubert, Chopin, Liszt etc. His music is very intellectual and complicated. To learn this piece you need very good technique as well as a mature musical sense due to the counterpoint, modulation and the difficult voicing. Your touch has to be graceful and elegant as well. Have fun practicing