Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:2/2
K:D
['de |:S', 'DFAF DGBB A2 ef gfed', 'fa gfed cAce']  
X:1
L:1/8
M:2/2
K:D
 de |:S fdAF DFAF | DGBB A2 ef | gfed cAce | b2 aa a2 de | fdAF DFAF | DGBB A2 ef | gfed cABc |1 
 dfec dcde :|2 dfec d2 |: Ad | f2 ff g2 g2 | a2 a2 a2 fa | gfed cAce | b2 aa a2 Ad | f2 ff g2 g2 | 
 a2 aa a2 fa | gfed cAce |1 dfec d2 :|2 dfec dcdeS ||  