Stephen Sackur talks to Brian Eno, the hugely influential contemporary music maker once styled the ‘brainiest guy in pop’ – except the word ‘pop’ does not really fit. Briefly a member of Roxy Music in the early '70s, he then went his own way, creating ambient music, developing audio-visual installations and collaborating with a host of big names including Bowie, U2 and Coldplay. His output has been prolific and varied, but what is he? A musician, a composer, or an artist impossible to label?(Photo: British musician and activist Brian Eno speaks at the the Democracy in Europe Movement 2025 (DiEM25), 2016, Berlin. Credit: Sean Gallup/Getty Images)