In addition to occasionally posting music at MuseScore, I also listen to pieces uploaded by other MuseScorians. The quality varies tremendously, but the best are very good indeed.
One composer whom I particularly enjoy is Tuukka Jokilehto, a.k.a. “Rivergrove.” Among other things, he writes many short, colorful pieces for beginning pianists, such as his collection of “skeleton” music. I recently ran his composition “Old Music Box” through Logic, using sounds sampled from an old music box.
Most of Hans Jacobi‘s piano pieces, while not of Lisztian difficulty, are nevertheless not for beginners, and I’m content to let the MIDI player perform them. He writes numerous modernist short pieces that embody his understanding of “wabi-sabi.” He has a subtle sense of humor that occasionally surfaces, such as when he imagines how Wagner would play the blues.