Some pieces of music for Kokyu, for example, "Tsuru-no-Sugomori" (a song depicting various aspects of the life cycle of the crane), were composed through playing for Shakuhachi bamboo flute music, and there are also pieces of music provided strongly with features of duets for Kokyu and So, for example, "Chidori no kyoku" described above.
曲によっては『鶴の巣籠』のように尺八楽との交流によって生まれたものもあるし、先の『千鳥の曲』のように箏との二重奏曲的性格の強いものもある。