Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/4
Q:1/4=220
M:4/4
K:G
['c B A', 'G2 G A B c d2 d2']  
X:1
L:1/4
Q:1/4=220
M:4/4
K:G
 c B A B | G3/2 A/ B G | c B A d | G2 G2 :: G A B c | d2 d2 | e/f/ g f e | d2 d2 :|  