Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:4/4
K:A
['A2 AcBA FE EFGB A2 cA cAce', 'ce ceef']  
X:1
L:1/8
M:4/4
K:A
 A2 AcBA FE | EFGB A2 cA | cAce aecA | Bcef e2 cB | A2 AcBA FE | EFGB A2 cA | cAce aecA | 
 BAGB A2 ce :| ceef ecBc | f2 fafe ce | ceef ecBA | cecA B2 ce | ceef ecBc | f2 fafe ce | 
 afec fecA | ecBc A2 ce :|  