Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/8
M:6/8
K:G
['GAB BAG', 'd2 c/B/ cde edc BAG dcB cBc']  
X:1
L:1/8
M:6/8
K:G
 D | GAB BAG | FGA AFD | GAB BAG | Bdd d2 :: c/B/ | cde edc | BAG dcB | cBc Adc | BGG G2 :|  