This is a double bill featuring two powerful but differing quartets: Forj led by drummer Jonathan Silk and featuring two saxophones, Josh Arcaleo and Joe Wright and bass player Nick Jurd and the Improvising String Quartet featuring Sarah Farmer and Angharad Davies on violin, Richard Scott on viola, and Hannah Marshall on cello.  There will be two contrasting but compatible sets and then they may form various sub groups from the eight players.