Of all the pieces of Sokyoku (koto music), both of Tsukushi-goto (the refined and elegant Sokyoku composed during the Azuchi-Momoyama period, which became the origin of Sokyoku in the early modern age) and the Yatsuhashi school of Sokyoku perform the music before sankyoku gasso, so they aren't to be played with other instruments.
また三曲に属する箏曲の中でも、筑紫箏、及び八橋流箏曲は三曲合奏以前の音楽を伝えているので、まったく他楽器との合奏を行なわない。