The Sonata for Trombone was commissioned in 1997 by the Phi Mu Alpha Sinfonia chapter at the University of Texas at Austin School of Music.
He continued:[3]A great deal of the Classical, Afro-Latin, jazz (improvisation) influences in the work again reflect the sound I had in my head when composing.
"The work has been played and featured at numerous concert and festival venues in North America, South America and the United Kingdom[4] The list of trombone artists who have added the work to their repertoire is substantial to include Tom Brantley, Chris Buckholz, Luis Bonilla, Greg Luscomb, Lance Green, Michael Davidson, Mark Hetzler, John Mueller, Jonathan Warburton and many others.
French-Canadian music critic Jean-Yves Duperron, "...when I listen to the excellent (trombone) Sonata by Jack Cooper, I keep hearing flashbacks of Leonard Bernstein from the West Side Story days.
[2] The work is scored for solo trombone with (F attachment) and piano but was expanded twice in recorded versions to include acoustic bass, bongos and congas.