Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:2/2
K:A
['A2 A2 ABcA BABc', '(3efg aece Acec dBGB E2']  
X:1
L:1/8
M:2/2
K:A
 E | A2 A2 ABcA | BABc B3 d | cdef edcB | ABcA EFGE | A2 A2 ABcA | BABc B2 f2 | fedc edcB | 
 B3 A A2 :: (3efg | aece Acec | dBGB E2 ED | CEAE cAec | aecA E2 (3efg | aece Acec | dBGB E2 f2 | 
 fgaf edcB | B3 A A2 :|  