Franz Liszt‘s Nocturne #3 (“Liebestraum,” 1850) begins in Ab major and jumps to B major at 1:28. At 1:45, it begins a rapid cycle through other keys, starting with C major. Pianist Matyas Novac delivers this Romantic period gem with such mastery and reverence!
But don’t take our word for it: Pianotv has produced an insanely detailed description of the piece (second video) — by request, no less!