A few 20th century composers that i know wrote heaps for percussion are Ross Edwards( wrote alot of solo marimba pieces, "Dragonfly Dances", "Marimba Dances"), and Nigel Westlake, "Omphalo Centric Lecture". Carl Vine wrote a awesome Percussion Symphony, and i think Matthew Hindson is currently writing a percussion concerto. that's all i really know off my head
