Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:4/4
K:D
['FE DFAd', 'A2 ga bgdB G2 b2 afdA F2']  
X:1
L:1/8
M:4/4
K:D
 FE | DFAd fdcd | BdAd GdFd | FAdc BAGF | G2 E2 E2 FE | DFAd gfed | cd a2 a2 e2 | fafd cAB^G | 
 A2 A2 A2 :: ga | bgdB G2 b2 | afdA F2 a2 | gaba gfed | g2 e2 e2 de | fdge afbg | fedc dfeg | 
 fdbg fdec | d2 d2 d2 :|  