Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:2/2
K:G
['d2 B2-']  
X:1
L:1/8
M:2/2
K:G
 DG |"G" B4 B3 B | d2 B2- B4 |"Em" B4 d3 B | A2 G2-"^(D7)" G2 A2 |"G" B4 B3 B | d2 B2- B2{A} G2 | 
"C" ABAG"D7" E2 F2 |"G" G6 :: Bd |"G" g4 g3 e | d2 B2- B4 |"G" g4 g3 a |"Em" b2 e2- e2 f2 | 
"C" gaba g2{f} e2 |"G" d2 B2- B2{A} G2 |"C" ABAG"D7" E2 F2 |"G" G4 :|  