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:A
['A3 fga', 'e3 e3 =gec ec^A c^AF d3 fdB']  
X:1
L:1/8
M:6/8
K:A
 A3 fga | edc Bcd | cde fdc | B2 A GFE | A3 fga | ecA Bcd | cag Tf2 e | Be^d e3 :: e3 =gec | 
 ec^A c^AF | d3 fdB | dBG BGE | c3 ecA | afd ecA | f3 edc | BAG A3 :|  