Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:6/8
K:G
['def d2 B', 'EAA A2 B']  
X:1
L:1/8
M:6/8
K:G
 A | def d2 B | cAA BGG | def d2 B | cAF G2 :: EAA A2 B | cAA BGG | EAA A2 B cAF G2 :|  