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]