Create musical compositions that adhere to the specified chord changes.
'G', 'D7', 'G', 'D7', 'G', 'G'  
X:1
L:1/4
M:3/4
K:G
 B/d/ |:"G" b a g |"D7" f d c/d/ | f d c/d/ |"G" g d B/d/ | b a g |"D7" f d c/d/ | f d c/d/ |1 
"G" g2 B/d/ :|2"G" g2 |]  