K. S. Nissar Ahmed, a prominent poet, said that Rajarathnam understood the minds of children, as well as what they needed.
He found himself jobless after doing his MA, and stood in for his ailing father who was a Kannada teacher in a school. He was quite distressed to see the kind of poems in the Kannada syllabus for such small children. That evening, while he was sitting and thinking, a poem, "Bannada tagadina tutturi", came to him without his bidding. He was thrilled with it, and taught it to his students the next day, who loved it too. He then went around teaching it to all the children he knew, until finally, it came to a publisher's notice, who asked him to write a few more poems and published his first collection of children's songs.