Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/8
M:4/4
K:G
['B2 AF d2 B2 AG (3FED E2', 'A6 GA B2 AG E2 GE DBAG']  
X:1
L:1/8
M:4/4
K:G
 B2 AF d2 B2 | AG (3FED E2 GE | DBAG ABcA | DEGD EGAc | B2 AF d2 B2 | AG (3FED E2 GE | DBAG ABcA | 
 DEGA G4 :: A6 GA | B2 AG E2 GE | DBAG DEDE | DEGD EGAc | A6 GA | B2 AG E2 GE | DBAG DEDE | 
 DEGD G4 :|  