Forming his NU Ensemble in 1997 to merge free-jazz, improv, noise and contemporary forms, Mats Gustafsson presented Hidros One for 9 improvisers, tape & conductor that same year, progressing over 25 years to this 9th conduction of the Hidros concept in his largest ensemble yet: 25 musicians in two 9-piece ensembles plus soloists, captured live at the 2022 Avant Art Festival in Warsaw, Poland.

Extending the duo of British improvisers, legendary vocalist and leader of London's The Gathering, Maggie Nicols, also performing on taps and percussion, and Confront label-leader, percussionist Mark Wastell performing on cymbals and frame drum, with Swedish percussionist Matilda Rolfsson on bass drum, captured in a captivating concert at All Ears in Oslo in 2023.