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
['B2 EB', 'B2 eg']  
X:1
L:1/8
M:4/4
K:D
 B2 EB GBEB | BEGB ADFA | B2 EB GBEg | gedB ADFA | B2 EB GBEB | BEGB ADFA | B2 EB GBEg | 
 gedB ADFA || B2 eg fded | B2 eg fddA | B2 eg fded | (3Bcd AG FDDA | B2 eg fded | B2 eg fddc | 
 dfaf gfed | (3BcB AF BE E2 ||  