Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:2/4
K:Amin
['', 'c/B/A/G/ ED EA-', 'AG EA-']  
X:1
L:1/8
M:2/4
K:Amin
 A/G/ |: E A2 c- | c/B/A/G/ ED | EA- AB | cA B>G | EA- Ac- | c/B/A/G/ ED | EA- AA/G/ | 
 A>B c/B/A/G/ | A2- Ac- | c/B/A/G/ ED | EA- Ae | d2 B>G | EA- Ac- | c/B/A/G/ ED | EA- AA/G/ |1 
 A2- AA/G/ :|2 A2- AB/c/ |: d2 eB | c>B AG | EA- AA | c/B/A/G/ A/B/c/e/ | d2 eB | c>B AG | 
 EA- AA/G/ |1 A2- AB/c/ :|2 A2- AA/G/ ||  