Write musical pieces that adapt to the predetermined chord shifts.
'G', 'G', 'D7', 'G', 'G', 'D7', 'G', 'G', 'D7', 'G'  
X:1
L:1/8
M:2/4
K:G
"G" [GG]4 | [GG]4 | [GG]4 | [GG]4 |]"G" [BG][dB] [dB][dB] | [BG][dB] [dB][dB] | 
 [BG][BG]"D7" [AD][AF] |"G" [GG]2 [GG]2 |:"G" [GG]2"D7" [AF]2 |"G" [BG][dB] [dB] z | 
"G" [BG][BG]"D7" [AD][AF] |"G" [GG]2 [GG]2 :|  