Synonyms for Accompanist:

n.

composer, drummer, bandsman, cellist, concertmaster, busker, fiddler, drum major, bassist. accompanist (noun)
accompanyist.
person (noun)
accompanyist.

Other synonyms:

composer, drummer, bandsman, cellist, concertmaster, busker, fiddler, drum major, bassist. Other relevant words:
fiddler, accompanyist, drummer.