Jazz Pianist Keith Jarrett. Called one of the greatest improvisers in the history of jazz, Jarrett was famous for his wildly passionate solo recitals. In 1996, Jarrett came down with a mysterious illness- an interstitial bacterial parasite-- that caused him to stop performing for about two and a half years. Jarrett has started performing and recording again, but he still keeps a low public profile, so his condition will not worsen again. His newest CD is Whisper Not (Universal Classics). His other recent CD, Melody at Night, With You, was a solo album Jarrett recorded at his home studio in rural New Jersey.