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
['D2 FA fedB AFFD E2 E2 D2', 'DAFA DAFA']  
X:1
L:1/8
M:4/4
K:D
 D2 FA fedB | AFFD E2 E2 | D2 (FA) fedB | AFEF D2 D2 :| fedB ABde | fafd e2 ef | fedB ABde | 
 faeg f2 d2 | DAFA DAFA | DAFA B2 E2 | DAFA DAFA | BABc d2 d2 | f2 df e2 cA | d2 Bd c2 AA | 
 BAFA BcdB | AGFE D2 D2 ||  