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 ded cAB c3 dcA GFG', 'a=fa d=fa a=fa ge=f g2 a ge=f']  
X:1
L:1/8
M:6/8
K:D
 =fAA ded | cAB c3 | dcA GFG | Add e=fg | =fAA ded | cAB c3 | dcA GFG |1 Add d3 :|2 Add d2 :| A | 
 d=fa a=fa | d=fa a=fa | ge=f g2 a | ge=f g3 | a(3=fed ded | cAB c3 | dcA GFG | Add d2 :|  