So Samuil Feinberg was an extremely talented pianist, known for his transcriptions of Bach, as well as a complete recording of the Well-tempered Clavier. He studied at the Moscow Conservatory under Alexander Goldenweiser, a composer I've been meaning to get around to exploring. He won the Stalin Prize in 1946, and composed in his career twelve sonatas, as well as fantasies and other works for piano, some including voice, and three piano concertos, which Wikipedia also notes are not standard in the repertoire... I haven't even heard them yet. I seem to recall not being able to find them, but a YouTube search yields some recordings. I must check them out.
His first and second sonatas were both composed in 1915, when the composer was 25 years old, and are his first two opus numbers. It seems most of his piano sonatas, with the exception of 1 and 11, are on YouTube or have recordings available, so I know nothing of his first.
The second is a busy, frighteningly complicated-looking and sounding second sonata for a young