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
['f3 efg a2 g f2 e', 'd3 A3 ABc d3 cBA F3 FGA']  
X:1
L:1/8
M:6/8
K:D
|: f3 efg | a2 g f2 e | d3 dcd | e2 d c2 A | f3 efg | a2 g f2 e | dcd efe | d3 d3 :: A3 ABc | 
 d3 cBA | F3 FGA | G2 E F3 | F3 EFG | A2 G F2 E | D2 D EFE | D3 D3 :|  