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). Muthuswami Dikshitar: Muthuswami Dikshitar (March 24, 1775 – October 21, 1835) was a South Indian poet and composer and is one of the Musical Trinity of Carnatic music.
i don't know