Jean-Jacques Birgé invited 28 improvising musicians to the studio to perform in duos and trios, the theme for each of the 22 recordings chosen just before each recording, with noted performers including Birgé himself, Sophie Bernado, Pascal Contet, Julien Desprez, Jean-Brice Godet, Alexandra Grimal, Sylvain Kassap, Edward Perraud, Eve Risser, &c.

With prior albums on For4Ears and Matchless, the French electroacoustic (with an emphasis on "acoustic") free improvising quartet Hubbub of Frédéric Blondy (piano), Bertrand Denzler (tenor sax), Jean-Luc Guionnet (alto sax), Jean-Sébastien Mariage (guitar), and Edward Peraud (percussion) present two extended, perfectly paced improvisations of stunning interplay and incredible technique.