The way I think about the practicing, it is my undercover work.Keith Jarrett in Interview in The Atlantic
Keith Jarrett sits down for his now-famous Köln-concert. The entirely improvised opus starts flowing through his fingers into piano as he hums and moans. We see only the maestro, the moment, but around him swirls worlds prepared beforehand. Not as a ready-to-heat meal but us a home-cooked masterpiece. Undercover work disclosed as wisdom played out on a keyboard.