연주자가 · 연주자를
performer, player (of an instrument)
Example
그 피아노 연주자는 어릴 때부터 상을 많이 받았어요.
That pianist has won many prizes since childhood.
Word parts
연 perform+주 play+자 person
연주 'musical performance' plus -자 'person'.
Good to know
Use 연주하다 for instruments; 악기를 치다/불다 is the everyday verb for specific instruments.