T. S. Radhakrishnan, popularly known as Radhakrishnaji, is an Indian composer and music producer of devotional music and film music from Ernakulam, Kerala. He has composed over 300 devotional albums. His albums have been collaborations with leading Indian singers such as K. J. Yesudas, P. Leela, P. Susheela, S. Janaki, P. Jayachandran, K. S. Chithra, Hariharan, Manjari, Unni Menon, among others. He has collaborated on more than 200 albums. Most of his songs were written by R. K. Damodaran, P. C. Aravindan, S. Ramesan Nair and Chowallur Krishnankutty.
Radhakrishnan was born on 5 November 1957 in Ernakulam, as the son of Sankaranarayana Iyer and Subbulakshmi Ammal. He is the seventh of their nine children. He was trained in Carnatic music by Tripunithura K.C. Kalyanasundaram Bhagavathar, Tanjore Subramania Bhagavathar, and Dr. S. Ramanathan.
He composed his first album "Harisree Prasadam" with ten songs in 1980 collaborating with Malayalam lyricist R. K. Damodaran and singers P Jayachandran, Kanhagad Ramachandran, Kavalam Sreekumar, Junior Mehaboob and Usha Manoharan. His earliest collaborations with K. J.