Create a musical piece with the provided alphabetic notation system and theme.
X:1
L:1/8
M:4/4
K:Bmin
['B2 fB', 'B2 GABG A2 Ag fgaf gecA GABG']  
X:1
L:1/8
M:4/4
K:Bmin
 B2 fB B2 fB | gfed cABA | G2 dG A2 eA | fedc dB B2 :| GABG A2 Ag | fgaf gecA | GABG ABda | 
 gecA Ad d2 :|  