In 1967 he created an electronic music studio at the Royal College of Music. This led to an invitation from the University of Melbourne in 1973 for a lecture tour, which in turn led to an invitation to become the Visiting Composer at the University of Adelaide in 1974. He remained there as a lecturer until 1986. He also wrote music criticism for The Australian.
Cary was one of the first British composers to work in musique concrète. In 1967 he created the first electronic music studio of the Royal College of Music. He built another at his home in Suffolk, which he transported to Australia when he emigrated there, and incorporated it into the University of Adelaide where he worked as a lecturer until 1986.
