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
['FAA FBd', 'A fef faf edB faa afa baf']  
X:1
L:1/8
M:6/8
K:D
 FAA FBd | BAG FAA | FBd B2 A | FAA FBd | BAG FEF | DFA B2 A :| fef faf | edB faa | afa baf | 
 a3 aba | gfe dBA | EFG B2 A :|  