However, the usage of the name wasn't strict, and the ensemble of koto, kokyu and shakuhachi was also called 'sankyoku' in a record from the late 18th century.
しかし厳密なものではなく、18世紀後半には箏、胡弓に尺八が加わった合奏を「三曲」と呼んだ記録もある。