noun
ancient 13-string koto used in Gagaku
A specific type of koto with 13 strings, used in traditional Japanese court music (Gagaku).
雅楽の演奏では、楽箏が優雅な音色を奏でる。
In Gagaku performances, the gakusō produces an elegant tone.
Compound of 楽 (gaku, 'music') and 箏 (sō, 'koto'), referring to the koto used in Gagaku. The exact historical derivation is uncertain, but the term is conventionally associated with the instrument's role in court music.