長七度堆積四度堆積和音 コード表記 Cq [C,F,B♭] Play CqBq [C,F,B♭,B,E,A] Play CqBqA♯q [C,F,B♭,B,E,A,A♯,D♯,G♯] Play CqBqA♯qGxq [C,F,B♭,B,E,A,A♯,D♯,G♯,Gx,Cx,Fx] Play