Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/8
M:9/8
K:G
['GAB GAB', 'B2 e']  
X:1
L:1/8
M:9/8
K:G
 GAB GAB E2 D | GAB d2 d dBA | GAB GAB e2 d | B2 e edB dBA :| B2 e e2 f g3 | B2 e edB dBA | 
 B2 e e2 f g2 g | agf gfe dBA :|  