Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:4/4
K:A
['ABce a3 e', 'ABce fc (3cBc aeeg ccfc']  
X:1
L:1/8
M:4/4
K:A
|: ABce a3 e | fece a3 a | ABce a3 e | fecB cB (3BAB | ABce [ac]3 e | fece [ac]3 e | agae faec | 
 dcBd cA A2 :: ABce fc (3cBc | aeeg ccfc | ABce fece | dcBA BAFE | ABce fc (3cBc | aeeg ccfc | 
 agfe fece | dcBd cA A2 :|  