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.

During the 20 years that preceded this set, Paul Motian had led some of the most intriguing jazz groups around. For this project, his "Electric Bebop Band" consists of two tenors (Chris Potter and Chris Cheek), two guitars (Kurt Rosenwinkel and Brad Schoeppach), bassist Steve Swallow, and the leader himself on drums. With the exception of Motian's opening selection and a pair of originals by Rosenwinkel, the repertoire consists of three songs by Thelonious Monk and one tune apiece from Bud Powell, Miles Davis, George Shearing, Charlie Parker, and Rodgers & Hart. Essentially a straight-ahead bebop date, the most unusual aspect of the set (which unfortunately has no liner notes, so individual soloists are not identified) is that there are many sections where two different players solo together…

This is an utterly fascinating tribute to the music of Thelonious Monk. Most of the selections feature the unusual trio of tenor saxophonist Joe Lovano, guitarist Bill Frisell (who with his wide range of original sounds is really a one-band band), and drummer Paul Motian. Tenor saxophonist Dewey Redman and pianist Geri Allen are guests on two songs apiece and fit in quite well with the sparse but very complete trio. Among the ten Monk songs explored, taken apart and given surprising treatment are "Evidence," "Bye-Ya," "Ugly Beauty," and "Trinkle Tinkle." Recommended to open-eared listeners.

On this unusual album, pianist Paul Bley's 1964 trio (with bassist Gary Peacock and drummer Paul Motian) is joined by tenor-saxophonist John Gilmore during his brief hiatus from Sun Ra's Arkestra. Unissued at the time (five of the eight numbers made their debut on Bley's IAI label), the music is explorative but not as free as one might expect. Best-known among the six Carla Bley originals (which are joined by Paul's "Turns") is the lyrical "Ida Lupino" which is heard in two versions. The music overall is quite stimulating and a bit offbeat, a reflection of Paul Bley's adventurous spirit.

Treasure Island, released in early 1974, was the second of two albums pianist and composer Keith Jarrett recorded for Impulse Records – the first was Fort Yawuh, issued a year earlier. Cut at Generation Sound Studios in New York City, the band consisted of Jarrett on piano and soprano saxophone, Dewey Redman on tenor, bassist Charlie Haden, and drummer Paul Motian. And though he would more than likely disagree, this was the best band he ever led. In addition to the quartet, guitarist Sam Brown contributes to a pair of cuts here as Guilherme Franco and Danny Johnson add percussion to the mix. The set kicks off with the beautiful "The Rich (And the Poor)," a folkish melody of the type Jarrett was exploring on ECM at the time, with some stellar African undertones – it's easy to hear the majesty of Abdullah Ibrahim's South African musical sphere in this mix, and earthy deep, sparer work by Redman and Haden.

This album gives one an interesting look at the early Keith Jarrett, who was already performing on an album of the Charles Lloyd Quartet and Miles Davis' early fusion band. He had not yet fully developed his style, but he was clearly on his way. These trio performances (with bassist Charlie Haden and drummer Paul Motian) are impressive for the period, but the best was yet to come.

While still a member of the Charles Lloyd Quartet, Keith Jarrett did some occasional moonlighting with a trio, anchored by two future members of Jarrett's classic quartet, Charlie Haden (bass) and Paul Motian (drums). On this CD, Jarrett turns in a very eclectic set at Shelly's Manne-Hole in Hollywood, careening through a variety of idioms where his emerging individuality comes through in flashes. He covers Bob Dylan's "My Back Pages" – which actually came out as a single on the Vortex label – in an attractive, semi-funky style reminiscent of Vince Guaraldi. "Pretty Ballad" delivers a strong reflective dose of Bill Evans, while "Moving Soon" is chaotic free jazz. By the time we reach "New Rag," we begin to hear the distinctive Jarrett idiom of the later trios, but then, "Old Rag" is knockabout stride without the stride. As an example of early, unfocused Jarrett, this is fascinating material.

Jarrett's 1970s albums may have confused some purists but they should be a goldmine for contemporary fans of all stripes who like improvised music. El Juicio is an excellent early Jarrett album and finds him in typically eclectic form with his classic American quartet. I nominate the opener, "Gypsy Moth," as the best piece on the record. Sounding a little like a more confident version of "Lisbon Stomp," from Jarrett's 1967 debut album Life Between the Exit Signs, Jarrett first whips up a rollicking theme on the piano and then switches to soprano sax towards the end, the rhythm section swinging hard throughout.

In 1999, a year after recording the splendid reunion album Not Two, Not One, Paul Bley’s highly innovative trio with Gary Peacock and Paul Motian took to the road with concerts on both sides of the Atlantic. When Will The Blues Leave documents a terrific performance at the Aula Magna di Trevano in Switzerland. Included here, alongside the angular freebop Ornette Coleman title track, are Paul Bley’s “Mazatlan”, brimming over with energy, Gary Peacock’s evergreen “Moor”, Gershwin’s tender “I Loves You Porgy” and much more. All played with the subtlety of master improvisers, recasting the music in every moment.