On the piano recital I gave as a high school senior, the composer represented by the most works was Robert Muczynski (b. 1929) – kind of a middle-of-the-road, unsystematically dissonant, respectable Americanist composer. I still have the Xeroxed scores my piano teacher gave me, in a box somewhere. Muczynski is primarily known for his flute music, it seems, particularly a sonata that still gets played. I am informed that he died Tuesday, in Tucson, whence whither he had emigrated from Chicago.
UPDATE: The redoubtable Walter Simmons gives a detailed tribute to Muczynski that reinforces and fleshes out the image I always had of him. His description of the music can’t, I think, be bettered.