Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:3/4
K:G
['(G3/2 A/)']  
X:1
L:1/8
M:3/4
K:G
 (G3/2 A/) | BG d2 (G3/2 A/) |[M:4/4] B(AG) EE z2 G |[M:3/4] AB(AG) B,C | DE D2 (D3/2 C/) | 
 B,D c2 BA | (G/A/) B(A/F/) D z D | G(A/B/)(cA) BG | (D/F/) A G2 ||  