As a periodic piano enthusiast, here's a couple of pieces to celebrate the Blue category:
One of the best variations by the guy who released the Lullaby song (Johannes Brahams)
Parts II and III of Alkan's Op. 33 are nothing short of genius.
Charles-Valentin Alkan should be in the same conversation as Chopin and Liszt in terms of virtuosity, but didn't have enough people playing politics for him in the years after his passing.
(I tried timestamping at 5:51, but who knows if that'll work):
The section starting around 13:44 is also of note. It's a very flowy section with multiple themes happening at the same time at one point, all played jy a human with only two hands.
Allegedly.