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:G
['G2 B>c d2 g2 fa', 'cA Bc d2 AB c/B/A', 'g/f/e fd/d/ df', 'd>c BA GB AD D/F/A/F/']  
X:1
L:1/8
M:2/4
K:G
 D | G2 B>c | d2 g2 | fa ef | gb/g/ dB | G2 B>c | d2 g2 | fa ef | g3 :: d | e>d cA | Bc d2 | 
 AB c/B/A | Be dd | ed cA | Bc d2 | AB c/B/A | G3 ::[K:D] g | g/f/e g/f/e | fd/d/ df | 
 eA/A/ A/c/e/c/ | df aa | (3gfe g/f/e | fd/d/ df | eA A/c/e/c/ | d3 ::[K:G] g | f>e d>c | BA GB | 
 AD D/F/A/F/ | GB dg | f>e d>c | BA GB | AD D/F/A/F/ | G3 :|  