Actually is the BG recordings what are of interest for us... There is if course MK, Guy, the Mac's, Robbie, Ianto, Danny, Marcus Cliffe and other players and singers well known... it would be a pity if they don't release all that recordings...
Now I'm wondering if the music during the representations would be played live by musicians or using playback from the BG recordings and the actors sing over it at the stage.