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
['fed edB', 'gfe fed']  
X:1
L:1/8
M:6/8
K:D
 eee e2 g | fed edB | eee gfe | fed edB | AAA ABd | edB gfd | eee gfe |1 fed e3 :|2 fed fga |: 
 b3 bag | aaa aga | bag bag | bgb agf | ggg gfe | fed edB | eee gfe | fed ega :|  