Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:6/8
K:D
['F2 D DFD', 'F2 d dcd', 'f2 d dfd']  
X:1
L:1/8
M:6/8
K:D
 A/G/ | F2 D DFD | AFD EFG | F2 D DFD | ABc dAG | F2 D DFD | AFD DFD | E2 =c cBc | G3 GFE :: 
 F2 d dcd | F2 A AGA | F2 d dcd | ABA BAG | F2 d dcd | F2 A AFA | E2 =c cBc | G3 GFE :| f2 d dfd | 
 dfd efg | f2 d dfd | a3 bag | f2 d dfd | afd dfd | e2 =c cdc | gfg efg | fdf ece | dcd BAG | 
 F2 d dcd | A3 ABc | dBd cAc | BGB AGF | E2 =c cBc | GAG BAG ||  