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:A
['A>c c>e (3f(ed) c>d (3e(fg)', 'a z ef ed cB AG AB']  
X:1
L:1/8
M:3/4
K:A
 [Ac]2 Bd/B/ A>c | c>e (3f(ed) c>d | (3e(fg) (3.a(gf) (3.e(fg) | (3f(ed) e>c AA | 
 (3.c(dc) (3.B(dB) A>c | c>e (3f(ed) c>d | (3e(fg) (3a(gf) (3e(fg) | (3f(^df) e2 z2 :: 
{efg} a z ef ed | cB AG AB | cd fe dc | Bd c4 |{efg} a z ef ed | cB AG AB | cf dc BA | GB A4 :|  