Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:4/4
K:Bmin
['Tf2 Bb', 'eAce fBdB fBde']  
X:1
L:1/8
M:4/4
K:Bmin
|: Tf2 Bb fBde | Tf2 Bb eAce | Tf2 Bb fBde | (f/e/f/g/ a)f eAce :: fBdB fBde | fBdB eAce | 
 fBdB fBde | (f/e/f/g/ a)f eAce :|  