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.
Rishabhapriya Rishabhapriya is a rāgam in Carnatic music (musical scale of South Indian classical music). It is the 62nd "melakarta" rāgam (parent scale) in the 72 "melakarta" rāgam system of Carnatic music. It is the "prati madhyamam" equivalent of "Charukesi", which is the 26th "melakarta". It is called Ratipriya in Muthuswami Dikshitar school of Carnatic music.