noun
koto player; koto musician
Refers to a person who plays the koto, especially as a professional or specialist in koto music.
彼女は有名な箏曲家です。
She is a famous koto player.
箏曲 is koto music, whereas 箏曲家 is the musician.
Compound of 箏曲 (sōkyoku, 'koto music') + 家 (-ka, 'specialist').