Compose a piece of music that adheres to the specified alphabetical framework and includes the provided theme.
X:1
L:1/8
M:6/8
K:Bmin
['fec fga', 'B2 a', 'BAB cBc aec']  
X:1
L:1/8
M:6/8
K:Bmin
|: fec BAB | fec fga | fec ecA | aec Ace | fec BfB | fec fga | faa ecA |1 cBB B2 e :|2 cBB B2 A |: 
 B2 a fga | B2 a ecA | B2 a fga | fec ecA | B2 a fga | B2 a ecA | faa ecA | cBB B2 A :: BAB cBc | 
 aec fec | BAB cBc | aec Ace | BAB cBc | aec fec | efa ecA |1 cBB B2 A :|2 cBB B2 e ||  