Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:4/4
K:A
['eA fA ec', 'ae ce Ac ec']  
X:1
L:1/8
M:4/4
K:A
 d | c/A eA fA ec | B2 fe fBBA | cA eA fA ec | Ac ef eAAB | Acea f2 ec | B2 fe fBBA | cA eA fA ec | 
 Ac ef eAAc |: ae ce Ac ec | Bffe fBBc | ae ce Ac ec | Ac ef eAAc :|  