There are many underplayed Schumann’s works that deserves attention and 2nd or 3rd listening, after which they become easier to understand and listen.
Few years ago, my teacher from Croatia gave a recital that included his Impromptu, op. 5 and selection from Intermezzi, op. 4 Have to admit that I’ve never heard those, but it was very interesting, esp. with op. 5, which was probably the first performance of that work in Croatia!
Some cycles you can really rarely hear as a whole - Novelleten op. 21, or even Bunte Blatter op. 99.
I like the Paganini caprices, but maybe only so much. This earned a tube upload a couple of months ago (headphone warning at 00:52, when he kinda explodes).
Diz piece haf wikid variationz and zum lezz zo. I think it wud be played mo often if it wuz lezz frowned upon to juz make a mazhup ov yo fav varz n unleazh it lyk dat in rectal
Blumenstuck Op. 19 and Nachstucke Op.23 don’t get played as much as the other sets, but they’re incredible. The Op. 72 fugues are interesting, and the introduction and Allegro Appassionato Op.92 is a strong work.
I suppose even the novelettes Op. 21 are underplayed.