Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/16
M:2/4
K:G
['A A2']  
X:1
L:1/16
M:2/4
K:G
 A B2 B A A2 B | d3 E G4 | A B2 B A A2 G | A3 E D4 | D2 D E A2 A G | E2 E D E F E2 | 
 A A2 B d2 z E | D B, D E G2 F E | D E2 B, A,4 |]  