Thirupparaithurai Srinivasan Rangarajan, professionally credited by his pseudonym Vaali (29October 193118July 2013), was an Indian poet who has the record for writing the most songs in Tamil cinema. He is also recognised for a five-decade-long association in the Tamil film industry and has written more than 15,000 songs. He acted in a number of films, including Sathya, Hey Ram, Paarthale Paravasam and Poikkal Kudhirai. He was honoured by the Government of India with the Padma Shri, India's fourth highest civilian honour in 2007.
Vaali was born in a Tamil Iyengar brahmin family as T. S. Rangarajan on 29 October 1931 to Srinivasan Iyengar and Ponnammal Iyengar. His native place is Thirupparaithurai, Tiruchirappalli district. Growing up, he studied at Higher Secondary School for Boys, Srirangam, Srirangam till he finished his SSLC. He went to Madras in 1950 seeking an opportunity in the Tamil film industry. In the 1960s and 1970s, he received patronage from actor M. G. Ramachandran and became a successful lyricist, in competition with poet Kannadasan, which he had chronicled in his autobiography Naanum Indha Nootrandum. Vaali has also authored other books such as Avathara Purushan, Pandavar Bhoomi, Ramanuja Kaviyam, Krishna Vijayam, Thamizh Kadavul, Kalaignar Kaviyam, Krishna Bhakthan and Vaaliba vaali. His song "Amma Endru Azhaikatha Uyir Illaiye" is carved in the stone in a temple in Trichy. He wrote songs for M. G. Ramachandran in 64 films and also for Sivaji Ganesan in 80 films. He wrote more than 15000 songs in Tamil films.
He died on 18 July 2013 in Chennai, following respiratory illness, at the age of 82.
Vaali is a five-time winner of the Tamil Nadu State Film Award for Best Lyricist