In an extensive career devoted to creative pursuit Treloar has addressed himself to the problems of relationship found at the intersection of notated music-composition and improvisation.
He commenced his musical career in the late 1960s, playing drums with various groups at local Sydney venues and in the early 1970s was very active in the Australian jazz scene, playing with musicians such as Alan Lee, with Roger Frampton and Barry Guy, Erroll Buddle, Judy Bailey, and Bernie McGann, then worked with Frampton again in the Intersection group in 1984, which toured Asia.
In the areas of jazz and improvised music Treloar has shared in creative partnerships with musicians such as: Roger Frampton, Mark Simmonds, Steve Elphick, Jack Thorncraft, David Ades, Bruce Cale, Carl Dewhurst, Bernie McGann, Simone De Haan, Daryl Pratt, Hamish Stuart, Peter boothman, Chuck Yates, Bobbie Gebert, Mike Nock, Dale Barlow, Michele Morgan, Scott Tinkler, Errol Buddle, Judy Bailey, John Clare.
Among composer commissions and premiere performances are: Gabor Reeves, Ron Reaves, Steve Reaves, Ros Dunlop, David Miller, Julia Ryder, Simone DeHaan, Christian Wojtowicz, Michael Kieran Harvey, Geoff Dodd, Mardi McSullea, Mike Nock, Hamish Stuart, Graeme Leak, Daryl Pratt, Tom O'Kelly, Pipeline Contemporary Music Project, The Astra Choir, Synergy Percussion, Victorian College of the Arts, Australian Broadcasting Corporation, the University of Tasmania Conservatorium, Miki KIDO, Shunsuke Omura, Takashi Yamane, Hisae Kido, Junko Kamishima, Sotoko Hiramatsu, Eri Yoshimura, Kimiko Sunakawa.
Throughout his career Treloar's thoughts and concepts regarding creative musical expression have been accounted for in various publications: Nation Review, The Sydney Morning Herald, East West Arts, Jazz, Sounds Australian, The Mercury, 24 Hours, etc.
A major event inspired by the poetry of Matsuo Bashō, October 2005, and for which Treloar provided the music, is indicative of the creative interaction he shares with the Japanese tradition.
It provides a space wherein individuals' concerns and abilities to enter into creative discourse might be enabled, and specifically, where the notion of interdependence is wholeheartedly embraced.