James Peter Giuffre was an American jazz clarinetist, saxophonist, composer, and arranger. He is known for developing forms of jazz which allowed for free interplay between the musicians, anticipating forms of free improvisation.
From Wikipedia (https://en.wikipedia.org/wiki/Jimmy_Giuffre) under Creative Commons Attribution CC-BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0/legalcode)