Produce music using the specified musical structure depicted in letters along with the provided musical theme.
X:1
L:1/8
M:2/4
K:A
['c2 (c/B/)A', 'a2 (a/g/)f g2 (g/f/)e']  
X:1
L:1/8
M:2/4
K:A
 c2 (c/B/)A | d2 (d/c/)B | c2 (c/B/)A | GB B2 | c2 (c/B/)A | d2 (d/c/)B | (c/d/e) (f/g/a) | 
 cA A2 :: a2 (a/g/)f | g2 (g/f/)e | f2 (f/e/)d | ce e2 | a2 (a/g/)f | g2 (g/f/)e | 
 (c/d/e) (f/g/a) | cA A2 | cAfd | ecdB | cAdB | GB B2 | cAfd | ecdB | c/d/e f/g/a | cA A2 :|  