Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
Q:1/2=100
M:2/2
K:G
['D3 E G3 A']  
X:1
L:1/8
Q:1/2=100
M:2/2
K:G
 GE | D3 E G3 A | BGdG B2 AG | G2 E2 (DE)(FG) | AFdF E3 G | D3 E G3 A | BABd efge | 
 (dc)(BA) (GF)(GA) | B2 G2 G2 ::  