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 Universal Music Group. 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 boxset 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 boxset, Shades and Bop-Be have only ever been released on CD in Japan. However, in October 2011 Shades was reissued internationally (with Mysteries, as a single disc set) as part of the Impulse! 2-on-1 series.
Disc 1: Shades
- "Shades of Jazz"
- "Southern Smiles"
- "Rose Petals"
- "Diatribe"
- "Shades of Jazz" alternate take
- "Southern Smiles" alt. take
- "Rose Petals" alt. take
- "Rose Petals" alt. take
All compositions credited to Keith Jarrett
Disc 2: Mysteries
- "Rotation"
- "Everything That Lives Laments"
- "Flame"
- "Mysteries"
- "Everything That Lives Laments" alternate take
- "Playaround" previously unreleased
All compositions credited to Keith Jarrett
Disc 3: Byablue
- "Byablue" (Paul Motian)
- "Konya" (Keith Jarrett)
- "Rainbow" (Margot Jarrett)
- "Trieste" (Motian)
- "Fantasm" (Motian)
- "Fantasm" (Motian) alternate take
- "Yahllah" (Motian)
- "Byablue" piano solo (Motian)
- "Trieste" (Motian) alt. take
- "Rainbow" (Margot Jarrett) alt. take
Disc 4: Bop-Be
- "Mushi Mushi" (Dewey Redman)
- "Silence" (Charlie Haden)
- "Bop-Be" (Keith Jarrett)
- "Pyramids Moving" (Redman)
- "Gotta Get Some Sleep" (Redman)
- "Blackberry Winter" (Loonis McGlohon; Alec Wilder)
- "Pocketful of Cherry" (Haden)
- "Gotta Get Some Sleep" (Redman) alternate take
- "Blackberry Winter" (McGlohon; Wilder) alternate take