Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
Q:1/8=160
M:6/8
K:Amin
['e c>BA A2', 'ef/e/d ef/e/d e2', 'c>BA a2 E']  
X:1
L:1/8
Q:1/8=160
M:6/8
K:Amin
 e | c>BA A2 e | c>BA A2 d | B>AG G2 d | BAG G2 e |"^5" c>BA A2 e | c>BA A2 E | Acd e2 d | 
 cAA A2 :: E |"^9" ABc ef/e/d | ef/e/d e2 c | GBc de/d/B | de/d/B d2 G |"^13" ABc ef/e/d | 
 ef/e/d e2 E | Acd e2 d | cAA A2 :: e |"^17" c>BA a2 A | c>BA a2 A | BAG g2 G | BAG g2 G | 
"^21" c>BA a2 E | c>BA a2 E | Acd e2 d | cAA A2 :|  