Kakarla Tyagabrahmam (May 4, 1767 - January 6, 1847), colloquially known as Tyāgarāja and Tyagayya was one of the greatest composers of Carnatic music or classical South Indian music. He, along with his contemporaries Muthuswami Dikshitar and Shyama Shastry, forms the Trinity of Carnatic music. He was a prolific composer and highly influential in the development of the South Indian classical music tradition. Tyagaraja composed thousands of devotional compositions, most of them in praise of Lord Rama. His compositions remain very popular even today. Of special mention are five of his compositions called the Pancharatna Krithis(English: 'five gems'), which are often sung in programs in his honour.

The Website which documents Accurate, Authentic & Comprehensive information about the Personality, Life, Works and Times of Thyagaraja by Prabhakar Chitrapu :
http://www.thyagaraja.org/Thyagaraja/Welcome.html