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
['G>DG GAG FDE F2', 'B>cB BAG ABA']  
X:1
L:1/8
M:6/8
K:G
 D | G>DG GAG | FDE F2 A | G>DG GFG | Add cAG | G>DG GAG | FDE F2 d | cAG FGA |{B} AGG G2 :: A | 
 B>cB BAG | ABA AGF | GAG GFG | Add cAG | B>cB BAG | ABA A2 d | cAG FGA |{B} AGG G2 :|  