Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:2/2
K:D
['(AG) FDFA dABG', '(3(ABc) dedc']  
X:1
L:1/8
M:2/2
K:D
 (AG) | FDFA dABG | (F<A) D2 D2 (AG) | FDFA dABG | (E<G) C2 C2 (AG) | FDFA dABG | 
 (F<A) D2 D2 (AG) | FDAD (3(EFG) CE | F2 D2 D2 :: (3(ABc) | dedc AGAB | cdcA d2 (3(ABc) | 
 dedc AGEF | (E<G) C2 C2 (3(ABc) | dedc ABAG | FEFG ABAG | FDAD (3(EFG) CE | F2 D2 D2 :|  