Write musical pieces that adapt to the predetermined chord shifts.
'Am', 'G', 'G', 'Am', 'G', 'G'  
X:1
L:1/8
M:2/2
K:G
 Bd |:"Am" e2 dB ABAG | EAAG ABcd | e2 dB ABAG |1"G" EGGF G2 :|2"G" EGGF GABd |]:"Am" e2 ge edBd | 
 eA A2 eABd | e2 ge edBA |1"G" (3B^cd ef g2 fg :|2"G" (3B^cd ef g2 |]  