His father was the late Santhana Krishna Bhagavathar.
[2] He had performed all over India and abroad and had been accompanied by vidwans like Mysore T. Chowdiah, Kumbakonam Rajamanickam Pillai, Palghat Mani Iyer, Nagercoil Ganesa iyer and Palani Subramaniam Pillai.
[2] Rangarajan had performed at Saint Tyagaraja music festival at Thiruvaiyaru for the past sixty years without a gap.
[2] He is the only musician who has sung in AIR Chennai since its inception without repeating a single song.
Rangarajan had the distinction of giving rare pallavi demonstrations at the Madras Music Academy using both hands for Thalam, comprising different Nadais.