Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/8
M:4/4
K:G
['B2 AG', 'g3 a']  
X:1
L:1/8
M:4/4
K:G
|: B2 AG BGGA | B2 AG Bded | B2 AG BG G2 | AcBG AGEG :| g3 a gede | gabg agab | g3 a gedB | 
 A2 BG AGEG | g3 a gede | gabg a2 ga | bgab gedB | A2 BG AGEG ||  