There are at least 4 bands/artists called Sirius B. The currently most active one is probably the Brazillian / future jazz act consisting of Joe Cavanagh and Azhar.
These are photos from concerts where Sirius B played, so they may be of other bands that played the concert as well.
Glastonbury Festival 2003 Jun 27 - 29, 2003 Shepton Mallet, England, United Kingdom Uploaded by Maf Daniel