The last time JoAnne Brackeen was in London it was for a series of duets with the Scottish saxophonist Tommy Smith in which the two unfamiliar partners found a remarkable communion. Here there was no such rapport.

For someone who wouldn't practise her classical exercises as a child, attended the Los Angeles Conservatory for only three days and taught herself everything she knows, JoAnne Brackeen has a devastatingly resourceful piano technique. But though glimpses of McCoy Tyner and Chick Corea can be found in her work, the boldness of rhythmic movement in her left hand and the vaulting development of motifs in her right give her a signature sound as commanding and independent as just about anyone else in contemporary piano jazz. In every solo in the opening set, and in a sumptuous unaccompanied account of Body and Soul, Brackeen hammered home these formidable strengths. But her group sounded as if it was negotiating the maze of her musical thinking for the first time. Javon Jackson, a dry-toned former Art Blakey tenorist (who shares with Brackeen an enthusiasm for Joe Henderson) edged tentatively through his solos. Drummer Dion Parsons seemed not to mesh with the leader's flying momentum or attempt to drive it harder, but pattered discreetly along in its wake. For all Brackeen's forcefulness, the group's performance was perplexingly calm at times.

Brackeen can bend familiar songs almost unrecognisably out of shape, and No Greater Love had its melody splintered into a series of terse, staccato bursts. Jackson hooked it together again in a murmuring sax solo occasionally dramatised by yelps and warbles, and Brackeen's break ran seamless double-time figures over a mixture of arrhythmically strutting chords and emphatic low-register walking phrases.

Someday My Prince Will Come was offhand, but Brackeen's alternately flouncy and meditative original, Pink Elephant Magic, pulled the band more tightly together, and the marching, Art Blakey-like Ghost Butter continued the process (despite a lot of tempo-switching) after an earthy and emphatic bass intro from Kenny Davis. Mixed perhaps, but Brackeen should be on everybody's list of the leading jazz pianists in the world.

· Ends tonight. Box office: 020-7439 0747.