Thiruchi Loganathan  Thiruchi Loganathan (24 July 1924 - 17 November 1989)  was a playback singer of the Tamil film industry. He is known for his work in movies such as "Manthiri Kumari" (1950) and "Parasakthi" (1952). He was married to Rajalakshmi, daughter of actress C. T. Rajakantham and Kali N. Rathnam. His sons are, T. L. Maharajan, Deepan Chakravarthy, and T.L. Thyagarajan, who are also popular playback singers. It is believed he married actress Shanmugasundari. Shanmugasundari had five daughters, among them popular singer and actress T.K. Kala, but little is known about the father. In the 1950s, many music directors including K. V. Mahadevan, S. M. Subbaiah Naidu, G. Govindarajulu Naidu, T. G. Lingappa, G. Ramanathan, Vedha, S. V. Venkatraman, T. R. Ramanathan, T. A. Kalyanam, Viswanathan-Ramamoorthy, M. S. Gnanamani, V. Dakshinamoorthy, S. Dakshinamurthi, G. K. Venkatesh, T. R. Pappa, Master Venu, A. M. Rajah, C. Ramchandra, Ghantasala, T. M. Ibrahim, S. Rajeswara Rao, S. Hanumantha Rao, T. Chalapathi Rao, P. Adinarayana Rao, M. Ranga Rao, M. B. Srinivasan and Shankar-Ganesh gave him opportunities to sing memorable songs. He sang memorable duets mostly with P. Leela and Jikki. He also sang with many others including, M. L. Vasanthakumari, M. S. Rajeswari, L. R. Eswari, P. A. Periyanayaki, T. V. Rathinam, A. G. Rathnamala, A. P. Komala, N. L. Ganasaraswathi, Radha Jayalakshmi, K. Jamuna Rani, K. Rani, P. Suseela, S. Janaki and U. R. Chandra.