Mysteries: The Impulse Years 1975–1976 is a four CD collection of the Keith Jarrett albums Mysteries, Shades, Byablue and Bop-Be. The set was released in 1996 by Impulse! Records and in 1997 by Aris / MCA. Previously unreleased alternate takes are present on each disc. The music was performed by Jarrett and his affectionately-titled 'American Quartet', composed of Charlie Haden, Paul Motian, and Dewey Redman. Guilherme Franco contributed additional percussion to Mysteries and Shades. In 1997, a 5-CD box set called The Impulse Years: 1973-1974 was also released, composed of Fort Yawuh, Treasure Island, Death and The Flower, and Back Hand. Aside from their appearances in this box set, Shades and Bop-Be have only ever been released individually on CD in Japan. Shades was later reissued internationally as part of the Impulse! 2-on-1 series in 2011. From Wikipedia (https://en.wikipedia.org/wiki/Mysteri...) under Creative Commons Attribution CC-BY-SA 3.0 (https://creativecommons.org/licenses/...)