Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:6/8
K:D
['B2 BBed cBA ABc', 'd2 A']  
X:1
L:1/8
M:6/8
K:D
 A | d2 ddcd | B2 BBed | cBA ABc | d2 f a2 A | d2 d dcd | B2 BBed | cBA ABc | d3 d2 :| f | 
 g2 eefe | d2 A ABA | a2 aaba | f2 d d2 A | dcd ede | fef gfg | abaagf | f3 e2 :|  