1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
grid threeeight { 0__0__0_ 1__1__1_ 2__2__2_ 3__3__3_ } map threeeight{ 0: Cm7, 1: F7, 2: BbM7, 3: EbM7 } play threeeight 1/16