The Collaborative International Dictionary of English v.0.48:
percussionist \per*cus"sion*ist\ (p[~e]r*k[u^]sh"[u^]n*[i^]st), n. A musician who plays percussion instruments. [WordNet 1.5] Note: The world-renowned deaf percussionist Evelyn Glennie prefers to be thought of as a percussionist who happens to be deaf. [PJC]WordNet (r) 3.0 (2006):
percussionist n 1: a musician who plays percussion instruments