The "Koln Concert" is a live album by American jazz pianist Keith Jarrett, recorded on January 24, 1975, at the Cologne Opera House in Germany. It features an improvised solo piano performance that showcases Jarrett's unique style, blending classical, jazz, and folk influences. The concert was not initially intended for release, but its exceptional quality led to widespread acclaim. Released in 1975, the album became one of the best-selling solo piano recordings in history. Its spontaneous nature and emotional depth have resonated with listeners, making it a significant work in the jazz genre. The "Koln Concert" remains a landmark in improvisational music.