I'm listening to a disc of lieder by Othmar Schoeck at the moment - Elegi op. 36. It's far less angular than I was expecting - not unattractive music, all told. Before that, some Brahms chamber music. And last night I listened to Leoncavallo's I Medici, which Opera Orchestra of New York is doing come April. Wish I could be there - it's a well-put-together piece. Not quite a masterpiece, but it gets better as it goes along, I find.
I'm not much into horn concertos per se, but Schoek's Horn Concerto has an unforgettable opening theme that I keep humming.