Bassist Kim Cass is among a vanguard group of Brooklyn-based improvisors who are creating works at the leading-edge of rhythmic acuity. Levs, his debut with Pi Recordings, features pianist Matt Mitchell and drummer Tyshawn Sorey, who called Cass “a singular composer and player: the man can do things that don’t seem possible on the bass, displaying a technical command of the instrument on the level of the most celebrated virtuosic performers in any genre of music.”The compositions on Levs were in…