Which Keith Jarrett album is a best-selling solo jazz record?

The Köln Concert

"The Köln Concert" is an improvised solo piano performance by Keith Jarrett that took place in 1975 in Germany. This album has become the best-selling solo jazz record of all time. Despite unfavorable circumstances, including fatigue, the poor condition of the piano, and back pain, Jarrett delivered a breathtaking performance that remains a landmark work in jazz. The album is a celebration of spontaneous creativity and the emotional capacity of live music.