Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
Q:3/8=105
M:6/8
K:A
['c2 B cBA']  
X:1
L:1/8
Q:3/8=105
M:6/8
K:A
 A | c2 B cBA | a2 g agf | ecA fdf | agf ecA | c2 B cBA | fga agf | gfe Be^d | e3- e2 |:  