After a stressful week, and day, I've discovered a fascinating work by Glazunov: His Piano Sonata #2.
This is a wonderful, yet very difficult work. Of course, it is demanding (the 2nd Movement (at least) has very specific fluid interval demands), yet the effect is splendid (per key/mode), as much of what I would ask of any composer from the Soviet period. (Ignore that, it's an unqualified statement!)
I like Glazunov, the little I've gotten to know, and I advise others (with the chops) to look into his works. His Symphonies are very well constructed, considering the Stalinist requirement to be, essentially, politically correct.
I'm attaching his 2nd Sonata (score), and see what you make of it. The CD's are readily available.
I hope you enjoy it!

L.