Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:C
['B2 G', 'BAG AFD']  
X:1
L:1/8
M:4/4
K:C
 BEA |[M:6/8][K:G]SOSOO .!fermata!PMTuCO MD2 | G3 B2 G | c2 A B2 G | GBd cAG | F3 DEF | GAG B2 G | 
 c2 A BAG | ded cAF | G3 G2 :: c | BAG AFD | DED FED | BAG AFD | F3 ABc | BAG AFD | DED FED | 
 (B/c/d)B cAF | G3 G2 :|  