Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:4/4
K:Bmin
['f2 Bf dfBd', 'Bafd Bafd']  
X:1
L:1/8
M:4/4
K:Bmin
 e | f2 Bf dfBd | cAce aecA | f2 Bf dfBd | cAec dBB>e | f2 Bf dfBd | cAce aecA | BcdB cdea | 
 fdec dB<B || d | Bafd Bafd | cAce aecA | Bafd Bafd | cAec dB<Bd | Bafd Bafd | cAce aecA | 
 Baga faef | dfec dB<B ||  