generous helpings of mellotron and Moog, of voices and processed sound, and you have a new animal.

Both Hancock and the Weather Report people have approached this new music cautiously, making sure of firm footing with each step. The progression is evident in their previous albums, and what was once a puzzling avoidance of the new freedoms opened up by Coleman, Coltrane, Ayler and Sun Ra can now be seen as a preference for self-contained development. There isn't a single tune on either of these new albums that follows the head arrangement-solos in sequence-reprise format standardized during the bop years, nor is there a tune that sticks to the same rhythm throughout. But neither is there the open-ended collective freedom which Sun Ra and Coltrane were promulgating while Hancock, Shorter and Zawinul were still making jazz albums by the book.

There is freedom, though, in the sense of improvisations that develop independent of chordal or rhythmic structures, and of interpenetrating washes of sound color that blend without set tempo. But these improvisations are all related to a compositional discipline that may develop thematic material over a long stretch of ensemble parts, solos, collective interaction, changes in tempo and direction. Even the pieces that have no single recognizable theme are organized, if only in terms of a progression of moods, instrumental combinations, and dynamics.

So much for similarities: the albums are quite different from one another. Crossings has three compositions, one by Hancock and two by saxophonist Bennie Maupin, that develop gradually in space and time. Hancock's "The Sleeping Giant" is the best. It features several distinct themes: a funky, popping section built on a rock-solid bass line, an out-of-tempo lyrical theme that changes only slightly each time it reappears, and an ascending, exploding motif. The sections frame solos by Hancock (a gem, one of the best he's recorded), trombonist Julian Priester (a swooping, very free statement over space sounds from the Moog), and Maupin, whose soprano here evidences an enviable control of harmonics. The various overdubs, fades and splices contribute to a unity that emerges only gradually, after several hearings, as the patterns of re-emerging ideas and lines come clear out of the piece's hypnotic flow. The Maupin tunes, "Quasar" and "Water Torture," are much freer and less unified, bu