Harris during his childhood years, he trained as a classical guitarist, making his professional debut on the instrument in 1987.
Jayaraj has said that his favorite musicians are Aruljothi balagopal (who played the tabla for Neem Musicals ) and M.S.Viswanathan.
He toured the world in 2011 with a program of film music titled "Harris on the Edge."
Harris Jayaraj has been a keyboardist & percussionist for various music directors based in South India. He has predominantly worked with A R Rahman, Karthik Raja, Vidhyasagar.
Harris worked a great deal with different charity organization helping the poor and made an awareness video/commercial to benefit the poor and school dropout children.
Music Director Dharan who had worked for movies like Parijatham, Sivi etc., has been working under Harris Jayaraj.
Some of the singers introduced by Harris Jayaraj include Nakul, Saindhavi, Srilekha Parthasarathy, Madhumitha, Nikhil Matthew, Mahathi and Suchithra Ramanathan.
Harris Jayaraj has recently revealed that his choice for singing 'Ragasiya Kanavugal' in Bheema