The followup to their 2019 Corbett vs. Dempsey album and formalizing their trio name as "The Underflow", is an epic double LP of diverse and inspired free-ea from the trio of Mats Gustafsson on flute, fluteophone, baritone saxophone & live electronics, David Grubbs on electric guiar & voice, and Rob Mazurek on piccolo trumpet, wooden flute, electronics, percussion & voice.

Recorded during two nights at Underflow Records and Art Gallery in Athens, Greece in 2019, The Underflow trio of Mats Gustafsson (reeds, fluteophone, electronics) from Sweden, with Chicago-based Rob Mazurek (trumpet, electronics), and David Grubbs (electric guitar) present an album of wide-ranging, powerful, often explosively eccentric, and always informed improvisation.

Andrea Belfi (percussion), David Grubbs (guitar), David Maranha (organ), and Pete Simonelli (voice) perform "Ten Intrusions", following the model set by Harry Partch's 1949-1950 composition "Eleven Intrusions".