Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:6/8
K:D
['D3 ABd', 'dBA E3 EFD FAB def eAA BAd', 'dBA B3', 'e3 edf edB A3']  
X:1
L:1/8
M:6/8
K:D
|: F3 FED | D3 ABd | fee efa | baf edf | edB A3 | D3 ABd | edf dBA | B2 e dBA :: E3 EFD | FAB def | 
 eAA BAd | e3 fed | e3 efd | AFA def | edf dBA | B2 e dBA :: FAA B3 | dBA B3 | fea efa | baf edB | 
 F2 A BAA | dBA B3 | edf dBA | B2 e dBA :: e3 edf | edB A3 | DFA dBA | d2 f edB | e3 edf | edB A3 | 
 edf dBA | B2 e dBA :|  