The Köln Concert is a concert recording by the pianist Keith Jarrett of solo piano improvisations performed at the Cologne Opera House in Cologne () on January 24, 1975. It was released in the autumn of 1975 by the ECM Records label to critical acclaim and went on to become the best-selling solo album in jazz history, and the all-time best-selling piano album, with sales of more than 3.5 million.