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
['dff cee', 'dfe dcB', 'dBA fAA eAA def gfe faf gfe']  
X:1
L:1/8
M:6/8
K:D
 dff cee | def gfe | dff cee | dfe dBA | dff cee | def gfe | faf gfe |1 dfe dBA :|2 dfe dcB |] 
 A3 B3 | gfe fdB | AFA B2 c | dfe dcB | A3 B3 | efe efg | faf gfe |1 dfe dcB :|2 dfe dBA |] 
 fAA eAA | def gfe | fAA eAA | dfe dBA | fAA eAA | def gfe | faf gfe | dfe dBA :|  