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
['FAAc BAdA BAdA Bd d2 FAAc BAdB', 'BcdB AFAB d2']  
X:1
L:1/8
M:4/4
K:D
 FAAc BAdA | BAdA Bd d2 | FAAc BAdB | AFDF E2 D2 :| dfed BcdB | AFAB d2 dd | efed BcdB | 
 AFDF E2 D2 | efed BcdB | AFAB d2 ef | gfed BcdB | AFDF E2 D2 ||  