Exit Plan June 21, 2021 Exit Plan (left to right): Brian Sandstrom, Tyler Damon, Steve Marquette, Mars Williams. Saxophonist Mars Williams has toured or recorded with a dizzying array of modern jazz and rock artists, along with leading many ensembles of his own (including the Grammy-nominated Liquid Soul). Exit Plan is a recently formed quartet with an improvisatory focus including Williams and other players from the Chicago free jazz world â drummer Tyler Damon, guitarist Steve Marquette and bassist/multi-instrumentalist Brian Sandstrom. Hear what they are up to at this BlueStem Jazz concert on the patio;