An obvious way for a duo to transcend the sonic limitations of the two instruments deployed is for one or both players to opt for a different axe. The element of surprise can be vivid, especially when executed as well as it is here. Gerry Hemingway's frequent switch from drum kit to vibraphone, or simultaneous use of the two instruments proves to be one of the highlights of an engrossing session, above all because the icy, at times gurgling tones create a smart contrast to the low, felt-like quality of his toms, hence busy, metallic pinpricks of high notes are sent showering down on a moving cushion of bass. Crispell effectively reinforces the impression by way of a busy, pummelling right hand that has a fantastically sparkling clarity amid its sustained assault. If there is a simpático responsiveness between the players then that could possibly be traced to their membership of one of the best bands that Anthony Braxton led in the 1980s, but given the work that the pianist has already done with such as Louis Moholo-Moholo it's clear that she can rise to the challenge of a twin engine setting.

Ambiguity – and flexibility – of the roles is an integral part of the approach here. Great momentum is often generated by drums and piano locking into a choppy, percussive surge that they then break and reshape by way of new rhythmic and melodic motifs. At times the high energy playing creates a winding wall of sound, and overall there is marked tonal density to some passages of the mostly lengthy pieces. Usually, these thick, viscose interludes give way to a dancing, streaming eighth note phrase from Crispell to the effect that fluency and turbulence, motion and suspension are juxtaposed. Hemingway has to be absolutely on the ball to both reinforce and counterpoint his partner and there are times when he either needs a touch more volume on his snare or could drop a bigger bomb on the kick drum. That said, the way that he pushes a hazy, half-time funk backbeat through a minefield of metric and tonal explosions on ‘Threadings’ is really masterful. Two very able musicians are using their chemistry to push and challenge rather than comfort each other, and, for the most part, the result is not short on thrills.