Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/4
M:2/2
K:C
['A A e e d e c', 'B2 B c B ^G A B']  
X:1
L:1/4
M:2/2
K:C
 A A e e | d e c B/c/ | d B e2 | c2 B2 :: B c B ^G | A B c2 |1 A/B/c/d/ e2 | d/e/d/c/ B2 :|2 
 d c/d/ e2 | d/c/B/c/ A2 |]  