Compose melodious music utilizing the prescribed letter representation and integrating the given thematic element.
X:1
L:1/8
M:4/4
K:Bmin
['f2 Bb fec<e', 'fB B2']  
X:1
L:1/8
M:4/4
K:Bmin
|: f2 Bb fec<e | f2 a2 c<Ac<e | f2 Bb fec<e | f>ga>f e<Ac<e :: fB B2 fBc<e | fB B2 c<Ac<e | 
 fB B2 fBc<e | f>ga>f e<Ac<e :|  