GK4 may sound like a dodgy government security firm, but, as most will know, their roots go back to the George Khan Quartet and beyond to the iconic (and still kicking) People Band. But where the People Band were a multi-voiced, multi-textured and – let's face it – often bloody loud outfit (check out their excellent Live at Café Oto 2008-2014, also released on Paul Jolly's 33 Records label), this quartet are more meditative, more intimate, with an almost chamber music touch.

Not that the fire's gone out of the Fire Music. But this is a different intensity again. ‘Improvisation 3’, for example, barely features Khan for over five minutes while Figgis sighs and wanders against rolling toms and a talking rather than walking bass; then in comes Khan all sucking and puckering and elbows out but it's Figgis' single strummed chord that takes us gently out.

Figgis likewise has a clarity in his trumpet playing in the next improv that sets up a nervy dialogue with Day that may have drowned in a busier format.

Khan's flute is also more to the fore, notably in ‘Improvisation 1’, and he's able to concentrate on tone and sustain and bends than perhaps a more tube-train packed format may allow. Jolly intends to release further recordings under the ‘People Band +’ banner, featuring old and newer recordings. Pin back your ears, there's more on the way.