Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:3/4
K:Amin
['A3 c', 'cB dc']  
X:1
L:1/8
M:3/4
K:Amin
|: A3 c BG | A2 B/c/d e z | A3 c BA | Gd B2 AG :: a3 g ed | c3 d eg | a2 ag ed |1 
 cB dc Ad/4e/4f/4g/4 ||2 cB dc AE ||  