Information for Mark Kavuma Presents - Magnum Opus at Southbank Centre, West End (Concert). For one night only, celebrate the release of The Banger Factory: Magnum Opus and immerse yourself in some of the very best of today's British jazz, featuring the likes of Marcina Arnold, Steve Brown, Rachael Cohen, Mussinghi B. Edwards, Theo Erskine and many more. Queen Elizabeth Hall