This might be Keith Jarrett's legendary Standards Trio in personnel terms, but don't expect even the most distantly-related offspring of My Funny Valentine or Autumn Leaves (both features of this group's earlier Tokyo live recording in 1996) to appear anywhere on this double-set's two hours of largely open improvisation.

Jarrett's almost 20-year long working relationship with bassist Gary Peacock and drummer Jack DeJohnette represents such a profound understanding that their ability to read each other's musical minds may make "free" improvisation impossible in the most rigorous sense of the term. But this trio playing free (if you can put aside Jarrett's famous repertory of vocal hoots, groans and ecstatic gasps) is more interesting than a lot of contemporary jazz bands playing a conventional repertoire.

The opening tracks of each disc run to more than half an hour, both beginning in limpid, pulseless free episodes and accelerating - and on the first one, Hearts in Space, the group produces some of its most electrifying spontaneous playing in recent times, bursts of it as straightahead, swinging and blues-inflected as anything the Standards Trio recorded in more conventional formats.

Jarrett's slow playing nowadays explores piano tone and the voicings of harmonies to such a contemplative degree it borders on meditation, and one or two of the original melodic motifs have a little of Chick Corea's child-song simplicity to them. Fascinating contrasts, but you have to travel deep into Jarrett's increasingly uncharted musical waters and trust him - the guiding beacons are further apart than they used to be.