It is the most successful solo jazz album of all time, but Keith Jarrett wants to see each of the 3.5 million copies of "The Köln Concert" stomped into the ground. Recorded on Jan. 24, 1975, in front of a live audience in the Cologne opera house, the hauntingly lyrical free improvisation became as much a part of '70s ambiance as the scent of pot and patchouli. In an interview with the German magazine Der Spiegel in 1992, Mr. Jarrett complained that the album had become nothing more than a soundtrack. "We also have to learn to forget music," he added. "Otherwise we become addicted to the...