Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:2/4
K:Amin
['A3 B c3 A cd/c/ BA B2', 'A4 e2 a2 g2 ag fg/f/ ed']  
X:1
L:1/8
M:2/4
K:Amin
|: A3 B | c3 A | cd/c/ BA | B2 E2 | B3 c | d3 B | de/d/ cB | A4 :: e2 a2 | g2 ag | fg/f/ ed | 
 e2 A2 | z f2 d | e2 ec | de/d/ cB | A4 :|  