Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
M:2/2
K:G
['AB c2', 'A6 AB cBcd e2 dc BABc d2']  
X:1
L:1/8
M:2/2
K:G
 Bc | d2 AB c2 BA | A2 GF G2 AB | c2 e2 dcBc | A6 :: AB | cBcd e2 dc | BABc d2 Bd | c2 AG F2 EF | 
 G6 :|  