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
['', 'fdf ecA', 'Bcd F2 A def gfg efg fdf']  
X:1
L:1/8
M:6/8
K:D
 ag |: fdf ecA | BdB AFE | DFA def | gfg efg | fdf ecA | BAG A2 G | FAA def |1 gec dag :|2 
 gec d2 A |: FAA BAG | FAA Bcd | F2 A def | gfg efg | fdf ecA | BAG A2 G | FAA def |1 gec d2 A :|2 
 gec dag ||  