Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:D
['', 'a3 a gfeg fefg afdf edef gece', 'A Afed cAce']  
X:1
L:1/8
M:4/4
K:D
 fg |: a3 a gfeg | fefg afdf | edef gece | dcde fdAd | a3 a gfeg | fefg afdf | edef gece |1 
 dfec d2 fg :|2 dfec d3 A |: Afed B3 B | Bgfe a3 A | Afed cAce | ageg fafd | Afed B3 B | 
 Bgfe a3 A | Afed cAce |1 agec d3 A :|2 agec d2 fg ||  