Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:4/4
K:Gmix
['D>D E>G A>B A>G E2 D>D EG', 'G2 D>E F>G E>D E>G AB G>A', 'ED D>D EG AB AG E2 DD']  
X:1
L:1/8
M:4/4
K:Gmix
 D>D E>G A>B A>G | E2 D>D EG Ad | B>A G2 :| D>E F>G E>D E>G | AB G>A E>G E>D | DE FG ED EG | 
 AB GA EG ED || D>D EG AB AG | E2 DD EG Ad | B>A G2 ||  