Quoted in "What'd I Say?" : The Atlantic Story : 50 Years of Music (2001) by Ahmet M. Ertegun; also partially quoted in What Is This Thing Called Jazz?: African American Musicians As Artists, Critics, and Activists (2002) by Eric C. Porter, p. 118, and Freedom Is, Freedom Ain't: Jazz And the Making of the Sixties (2005) by Scott Saul, p. 154
Context: Good jazz is when the leader jumps on the piano, waves his arms, and yells. Fine jazz is when a tenorman lifts his foot in the air. Great jazz is when he heaves a piercing note for 32 bars and collapses on his hands and knees. A pure genius of jazz is manifested when he and the rest of the orchestra run around the room while the rhythm section grimaces and dances around their instruments.