Harris made his debut in Telugu cinema with Vasu. The title track of Lesa Lesa was the first song in India to be released as a single prior to a film soundtrack album release (The first ever single to be released prior to an album was Anaida's 'hotline').

He then worked in Lesa Lesa directed by Priyadarshan. Most of the tunes from the Tamil version were retained in the Hindi version too, and only two fresh tunes were composed. He also composed for the Hindi remake of Minnale titled Rehnaa Hai Terre Dil Mein, also directed by Gautham Menon. The following soundtrack albums 12B and Majunu met with high acclaim and praise. He received the Filmfare Award for Best Music Director – Tamil for his work in Minnale, breaking the 9 years continuous record of A.

The album was well received, particularly the song Vaseegara was exceptionally popular. Harris debuted as a film composer with Gautham Menon's Minnale. In his early years, he admired music composers M. While working as an additional programmer under Rahman, he composed music for various television commercials including a Coca-Cola commercial featuring actor Vijay. Rahman, Sadhu Kokila, Mani Sharma, Karthik Raja, Yuvan Shankar Raja, Vidyasagar. He worked under noted composers including Raj-Koti, A. He then started programming with his Roland MC-500 and went on to work as a programmer under more than twenty five music directors in Kannada, Tamil, Telugu, Hindi and Malayalam, working in more than 600 projects till the year 2000. He started playing keyboard and developed interest over synthesizers. He started his music career as a guitarist in 1987 at age twelve. Harris scored the highest mark in Asia on his 4th grade exam of Trinity College of Music, London. His father wanted him to become a guitarist and made him learn classical guitar from Mr.A.Abdul Sattar. At age six, Harris began his formal training in carnatic music. Jayakumar, was a noted film guitarist and an assistant to Malayalam music director Shyam and later became a noted musician and film composer.

He studied at Krishnaswamy Matric School. He was born into a middle class Tamil Christian family. Harris Jayaraj was brought up in Chennai.

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