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.
They Have released 6 albums, the most recent one being Bagunca on Freestyle records.
They have enjoyed a lot of popularity in Japan, where all there albums have been released by P-Vine records.
They have also appeared on Many compilataions, played Live alongside Joyce, Caetano Veloso.