Jayalalithaa said that MSV, as Viswanathan was fondly addressed, was hailed as the 'King of Melody' and remained a legend in Tamil cinema.
She expressed grief over his demise, recalling that he was a loving, humble, affable and spiritual person, whose musical journey had started at the age of 13.
Viswanathan had composed music for over 1,200 films, 700 of them in association with his former partner T K Ramamurthy, besides crooning many numbers.
The Chief Minister, a yesteryear actor, recalled she had sung songs, including the hit 'O meri dilruba' in the Tamil film 'Suriyagandhi' besides others for which he had set the tunes.
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It would 'not be an exaggeration' to say that his songs still continue to be popular among people, she added.
However, despite a number of awards won by him, he was not presented with the prestigious Padma awards, she said adding this was a matter of regret for her.
Viswanathan with his unparalleled talent had brought great pride to Tamil cinema and the state in particular and his death was an "irreparable loss" to the tinsel town, she said, while expressing her sympathies with the family of the deceased and the film fraternity.