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.

An epic journey in free vocal improvised music from the trio of vocalist Anna Gadt with Zbigniew Chojnacki on accordion & live electronics and Krzysztof Gradziuk on drums, performing live in the studio in Nieport, Poland, with arrangements, deconstructions and original music by Anna Gadt, along with the theme from "Monumentum pro Gesualdo" by Igor Stravinski.