Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:3/4
K:D
['dD cD AD', 'd2 B2 BA AF G2 FE FA', 'F G2 F2 EF FA GF ED']  
X:1
L:1/8
M:3/4
K:D
|: dD cD AD | A6 | GA, FA, DA, | D6 | dD cD AD | e6 | GA, FA, DA, |1 CA, D4 :|2 D4 DB, || 
 A,2 D2 DF | E/F/A D2 d2 | B2 BA AF | G2 FE FA | A,2 D2 DF | E/F/A D2 d2 | e2 dc AF | B3 A Bc || 
 d2 c4 | Bc A3 F | G2 F2 EF | FA GF ED | CD ED EF | E/F/A d2 cA | AG GF GA | D6 ||  