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
['cA eAcA', 'aefd ecBA', 'AEFE AEFE', 'A3 B cdec acec fdec B2 Bd']  
X:1
L:1/8
M:4/4
K:A
 E | A2 cA eAcA | EAcA B2 Bc | (3AAA cA eAcA | FdcB A3 :: g | aefd ecBA | aefb g2 (3efg | 
 aefd ecBA | FdcB A3 :: E | AEFE AEFE | DFCE B,2 B,2 | AEFE AEFE | FdcB A3 :: B | cdec acec | 
 fdec B2 Bd | cdec fdec | FdcB A3 :|  