Produce music using the specified musical structure depicted in letters along with the provided musical theme.
X:1
L:1/4
M:3/4
K:G
['B A']  
X:1
L:1/4
M:3/4
K:G
 D | G G G/G/ | A A B/B/ | c3 | G z B/c/ | d3/2 e/ d | A A d | d c B | A z d/>c/ | B A B | G G B | 
 G A B | A z B | G G e | d3/2 c/B/d/ | d/c/ B A | G z B | G G e | d3/2 c/B/d/ | d/c/ B A | G z |]  