I haven't worked on many contemporary pieces but here are a couple I can think of off the top of my head:
-Hindemith Sonata
-Psy by Berio
-Ranjbaran Ballade for Unaccompanied Bass
-Fryba Suite
There are also the Koussevitzky pieces which are more in a Romantic style than a modern style.
And there are the contemporary concertos, which are probably some of the hardest rep out there like Tubin and Schuller
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