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:D
['D2 D2 E2']  
X:1
L:1/8
M:4/4
K:D
 DE | =F2 D2 D2 E2 | =FF D2 D2 E2 | =F2 FFGGGG | A3 _B A2 =FG | A2 _BB =c2 A2 | _BAG=F E2 FG | 
 A2 =FG A2 (3GFE | D2 C2 D2 |]  