Prolific tenor saxophonist Ivo Perelman wanted to be on ESP, because ESP's 1967 Gato Barbieri album In Search of the Mystery was an important record for Perelman, both being South American tenorists of an avant bent. So it is no coincidence that the drummer on In Search of the Mystery, Bobby Kapp (who's also on Noah Howard's second ESP-Disk', At Judson Hall (1968)), mans the kit for the present album. For that matter, the bassist, William Parker, made his recorded debut on ESP as well, playing on Frank Lowe's Black Beings (1973). And Perelman has a twenty-three-year/thirty-three-and-counting-albums collaboration with pianist Matthew Shipp, who's been associated with ESP since 2015. Kapp and Shipp are on Perelman's 2017 Leo album Tarvos, Parker and Shipp have made multiple albums with Perelman, and this is even the second time out for this quartet, after 2017's Heptagon (Leo).