Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
M:6/8
K:G
['G>DG GAG FDE F2', 'B>cB BAG ABA', 'd2 e f2 g a2 g f2']  
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 | AGG G2 :: A | 
 B>cB BAG | ABA AGF | GAG GFG | Add cAG | B>cB BAG | ABA A2 d | cAG FGA | AGG G2 :: B | d2 e f2 g | 
 a2 g f2 d | cAG FGA | Add cAG | d2 e f2 g | a2 g f2 d | cAG FGA | AGG G2 :|  