The 1975 Köln concert is one of the best-known records by Keith Jarret. No matter how dull "in Part II B, Jarrett improvises over an F# minor vamp for approximately the first 6 minutes," (to quote Wikipedia) may sound, it really makes one of the most stunning pieces of piano music ever.
See also: http://en.wikipedia.org/wiki/The_K%C3%B6ln_Concert http://www.allmusic.com/cg/amg.dll?p=amg&sql=10:0w5zeflk7gf5
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