Assemble a piece of music by merging the alphabetic representation of the predetermined musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:G
['GBAG E2 GE DEGA BGAB c3 e', 'BGAB c3 e']  
X:1
L:1/8
M:4/4
K:G
|: GBAG E2 GE | DEGA BGAB | c3 e dBGd | egdB (3ABc BA | GBAG E2 GE | DEGA BGAB | c3 e dBGB |1 
 AGFA G3 F :|2 AGFA G2 (3Bcd |: gGGf GGeG | deed BGAB | c3 e dBGB | ABcd ed (3def | gGGf GGeG | 
 deed BGAB | ce e2 dBGB | AGFA G2 (3Bcd | gGGf GGeG | deed BGAB | c3 e dGBd | egdB (3ABc BA | 
 GBAG E3 G | DEGA BGAB | c3 e dBGB | AGFA G4 ||  