Which South Indian poet and composer has a school of music where Sooryakantam  is called Chāyāvati ?
Suryakantam Suryakantam or Sooryakantam (pronounced sūryakāntam) is a rāgam in Carnatic music (musical scale of South Indian classical music). It is the 17th "melakarta" rāgam (parent scale) in the 72 "melakarta" rāgam system of Carnatic music. It is called Chāyāvati in Muthuswami Dikshitar school of Carnatic music.
M. L. Vasanthakumari Madras Lalitangi Vasanthakumari (Tamil: மெட்ராஸ் லலிதாங்கி வசந்தகுமாரி ) (popularly referred to as MLV) (3 July 1928 – 31 October 1990) was a Carnatic musician and playback singer for film songs in many Indian languages. MLV and her contemporaries D. K. Pattammal and M. S. Subbulakshmi were popularly referred to as the "female trinity of Carnatic Music. A prime disciple of the G. N. Balasubramaniam, she was the youngest among the established musicians of that era, and was the youngest female awardee of the "Sangita Kalanidhi" award.