Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
Q:1/4=180
M:4/4
K:G
['D2 G2', 'B3 A GA B2']  
X:1
L:1/8
Q:1/4=180
M:4/4
K:G
 D2 G2 D2 G2 | F2 E2 F2 E2 | D2 GG D2 G2 | F2 G2 A4 | D2 G2 D2 G2 | F2 E2 F2 E2 | D3 D B3 A | 
 G2 F2 G4 :: B3 A GA B2 | c3 B AB c2 | B3 A GA B2 | AG FE D3 A | B3 A GA B2 | c3 B AB c2 | 
 B2 G2 A2 F2 | G4 G4 :|  