John Webber has conducted in Australia, New Zealand, in the midwest and southern United States. These have included performances in most of the cathedrals in the state of Queensland, the concert hall of the Queensland Performing Arts Complex in collaboration with the National Youth Choir of Great Britain, Mayne Hall, the University of Queensland, the opera theatre of the Queensland Conservatorium of Music, Griffith University, the theatre of Griffith University, Carseldine, and the Anglican cathedral of Auckland. He has led performances of a number of works for chorus and orchestra, including all the major choruses from Messiah, Vivaldi’s Gloria and Magnificat, Rutter’s Magnificat and Requiem, Handel's Ode to St Cecilia's Day and Zadok the Priest, a Buxtehude Magnificat, a Boyce Cantata, and Lully’s Te Deum.
In 1992 he formed Vox Australia, latter to become “The Company of Voices” a professional chamber choir that achieved critical acclaim through performance and recording. Opera Australasia stated that The Company of Voices performed in "a weekend of choral history... a connoisseur program, the pick of the 16th century presented in meticulous style"