Produce music using the specified musical structure depicted in letters along with the provided musical theme.
X:1
L:1/8
M:4/4
K:G
['D/E/ =FEF cFA G2 G d^cA =cBc', 'G2 z']  
X:1
L:1/8
M:4/4
K:G
 D/E/ | =FEF cFA | G2 G d^cA | =cBc ABc | BGG G2 D/E/ | =FEF cFA | G2 G d^cA | =cBc d^fa | 
 gdB G2 :| z | _BAG =Bcd | ^cAG ^FDD | =FEC ^FGA | ^FGA G2 z | _BAB c=Bc | d^fa g2 a | bag ag^f | 
 gdB G2 ||  