Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:2/4
K:A
['e>c c>efa']  
X:1
L:1/8
M:2/4
K:A
 f4 cc/c/ | cefe/c/ | Befe/c/ | f2 e>c | c>efa | c/BA/ F2 | FAcA | BB/c/BA A2 f4 cc | cefe/c/ | 
 Befe/c/ | f2 e>c | c>efa | c B2 A F2 f4 | f4 | f4 | a2 e>c | c>efa | c B2 A F2 FAcA/F/ | FBcB/A/ | 
 BA A2 | f4 | f4 |]  