They started as assistants to Tamil music composers
M. S. Viswanathan and
T. K. Ramamoorthy in 1964 and later the duo assisted M.S.Viswanathan alone from 1965 till 1967. When Shankar Ganesh were composing for a stage play titled "Paadi Parandha Kuyil", Kannadhasan started his own film titled "Nagarathil Thirudargal" in which he introduced Shankar Ganesh as music directors. However that film was stopped, so Kannadhasan took them to Chinnappa Devar and requested him to give them a chance thus making their debut with
Magaraasi. After Kannadhasan's death, Shankar Ganesh had their titles changed to " Kavinger vazhangiya thevarin" Shankar Ganesh. Kaveri Thanda Kalaiselvi was a Natya Nadagam (Dance Drama) wherein Jayalalitha was main lead and rehearsals used to happen at her house with all artistes and musicians coming to her house and doing practice. Shankaraman, musician duo Shankar and Ganesh used to come to play music. Sandhya used to make food and give all artistes breakfast and lunch. This went on for 28 days before the first show happened in 1965. After Jayalalitha became a huge star she recommended
Devar Films to give musician duo Shankar Ganesh their debut film as a music director in the film Maharasi starring Ravinchandran with Jayalalitha. Their first independent release was
Magaraasi in 1967.
Aattukara Alamelu was a turning point in their career. Musician duo Shankar Ganesh composed music for 2 films of Jayalalitha – Maharasi in 1967 produced by Devar Films and Vandhale Maharasi in 1973 directed by K.S.Gopalakrishnan. Their best known composition were in Naan Yen Pirenden and Idhaya Veenai. ==Bomb blast==