I don't like the extra ending. It interrupts the flow too much. Also, Leslie Howard's recordings of it I don't like at all. They are too slow. Check out Cziffra's (slightly edited score-wise) recordings of the piece to hear what it might have sounded like in Liszt's hands. With Cziffra, it flies like it should.Howard doesn't "add" parts to the music unless it was an incomplete piece to begin with. All pieces which have sections added by L.H. say "Completed by L.H." in the track name.Donjuan - the Dover book (Mephisto Waltz etc) copies an edition of the Grand Galop from before the extended ending was discovered. Also, the version of Czardas Macabre included in the same book is considered an outdated edition because when Liszt re-worked the piece he added an introductory section (not in the Dover edition) along with other figurations of the music in the middle and ending.
about that Czardas Macabre, YES I know, it pisses me off too, because I really like the later added bits that Leslie Howard shows us. Do you have sheet music for the newer version?
"What is the deepest interpretation of GGC?"
This is kinda off topic, but I just got a recording of Cziffra playing 10 of the Hungarian Rhapsodies, and I don't like most of them at all. It's technically impeccable, but his rubato is too much, even for Liszt, and his tone is horrible, especially in the lower registers. Even Horowitz never made such ugly tone as Cziffra does on that disk.