import musicpy
from musicpy import *
a = (C("Cmaj7") | C("D7") | C("Fmaj7",3) | C("Cmaj7/-3")) % (1, 1/4) * 4
b_duration = [3/4, 1/8, 1/8, 3/4, 1/8, 1/8, 1/4, 1/4, 1/2, 1/2, 1/2]
b_interval = b_duration
b = (chord("G5, F5, E5, F5, E5, D5, E5, D5, C5, B4, G4")
        % (b_duration, b_interval)) * 2
song = build([a, 5, 0],
             [b, 49, 4],
             bpm=165)
play(song)