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
['B2 Bc A2 (3ABc dcdA G2', 'g2 fe']  
X:1
L:1/8
M:4/4
K:D
 A2 | B2 Bc A2 (3ABc | dcdA G2 FG | A2 AB cABG | F2 DD D2 GA | B2 Bc A2 (3ABc | dcdA G2 FE | 
 DEFG ABAG | F2 DD D2 :: de | fefg a2 gf | gfga g2 fe | defg abag | f2 d2 defg | agfa g2 fe | 
 fdcA f2 ed | cABA GBAG | F2 DD D2 :|  