Here's a recording of the Anthony Braxton Quartet at the Civic Theatre in Leeds from their 'Forces in Motion' tour in November 1985. Three of the concerts from that tour are available on CDs from Leo Records, but each is quite different, and this is no exception.
The first half is by far the strongest, with extended improvisation that really catches fire. The quartet is outstanding, producing extraordinary music. Reeds, bass and drums shine, but the key player, to my mind, is Marilyn Crispell, who holds the entire set together. The second half fails to sustain this - perhaps it is from fatigue, or a poor venue, but there is an aimless introductory improvisation which is barely rescued in the latter stages by Braxton and Crispell. There is a good write up of this concert in Graham Lock's 'Forces in Motion' book, and it's from this that I've taken the set list.
The sound is adequate, but no better than that, so this is offered in mp3 only. Thanks to the original taper and seeder. If there are unreleased recordings of the other concerts from this tour, I'd be very interested in hearing them.
Anthony Braxton Quartet
November 24, 1985
Set 1: Composition 122 (+ 108A), Composition 69N, Composition 69Q, Piano solo from Piano Piece 1, Composition 69M
Part 1a - 46.15
Part 1b - 6.09
Set 2: Composition 69H, Bass solo from Composition 96, Composition 69(O), Composition 116
Part 2 - 41.05
Anthony Braxton (cl, fl, as, Cm-sx, sss)
Marilyn Crispell (p)
Mark Dresser (b)
Gerry Hemingway (d)