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:A
['AAA cBA cee ecA dff', 'ecA dff']  
X:1
L:1/8
M:6/8
K:A
|: e | AAA cBA | cee ecA | dff ecA | cBB BcB | AAA cBA | cee ecA | dff ecB | cAA A2 :: e | 
 aaa ecA | dff ecA | dff ecA | cBA Bce | aaa ecA | dff ecA | dff ecB | cAA A2 :|  