Since 1985, Thulin has been the musical coordinator and pianist for Michael Feldman's Whad'Ya Know? In this capacity, he has shared the stage with such jazz and blues greats as Von Freeman, Claude Williams, Ernestine Anderson, Howard Levy, Barbara Carr, The Memphis Horns, Dave Stryker, and many more. The show has showcased Thulin's unique combination of blues, bebop, and pianistic, hard- swinging grooves. John performs many of his own compositions on the show, as well as at live performances and on recordings.