4 bars random chord progression Ver.1.1
Song Key：
Random
C
C#
D
D#
E
F
F#
G
G#
A
A#
B
# or b：
#
b
Triad or 7th：
Triad
7th
Song Key：C or Am
｜ F ｜ Dm ｜ G ｜ C ｜