accompanyist

/əˈkʌmpənɪst/
noun
  1. A musician who plays a supporting part for a soloist or group, especially on a piano or guitar.
    • The singer hired an accompanyist to play piano during her performance.
    • The violin solo was beautifully supported by the accompanyist on the harpsichord.
    • As an accompanyist, she spent years playing for choirs and solo vocalists.
Antonyms
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