Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:9/8
K:G
['GBG AGE EDD (3GAB G AGE c2', 'G{B}AG G (3ABc']  
X:1
L:1/8
M:9/8
K:G
|: GBG AGE EDD | (3GAB G AGE c2 A | BAG AGE EDE | GED DEF G2 D :: G{B}AG G (3ABc dBG | 
 ABA A (3Bcd ecA | G{B}AG G (3ABc dBA |1 GED DEF GDD :|2 GED DEF G2 D ||  