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
['B3 Bcd', 'Bcd fed edc']  
X:1
L:1/8
M:6/8
K:D
|: D3 DEF | ABA AFA | B3 Bcd | cBA GFE | D3 DEF | ABA AFA |1 B3 BAG | F3 E3 :|2 B3 Bcd | c6 |: 
 B3 Bcd | B3 Bcd | fed edc | dcA dcA | B3 Bcd | B3 Bcd | fed edc |1 Adc d2 c :|2 Adc d3 ||  