Compose a piece of music using the specified alphabetical notation system and the provided theme.
X:1
L:1/8
M:4/4
K:Bmin
['FB B2', 'BF F2']  
X:1
L:1/8
M:4/4
K:Bmin
 FB B2 Ac c2 | d2 fd eAcA | FB B2 FBBc | Acef c2 BA | FB B2 Ac c2 | d2 fd eAcA | B2 fB ecAB | 
 BAdc B2 BA | FB B2 Ac c2 | d2 fd eAcA | FB B2 FBBc | Acef c2 ba | bfab efaf | eAcd dcBA | 
 BF F2 ABcf | f2 ec B3 z |: B2 c/B/A BF F2 | EFAB ceae | fB B2 FBBc | Acef c2 ba | bfab a2 fe | 
 cfec ecAc | BF F2 ABce | f2 ec B2 BA :|  