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.
Kosalam Kosalam (pronounced kōsalam) is a rāgam in Carnatic music (musical scale of South Indian classical music). It is the 71st "Melakarta" rāgam in the 72 "melakarta" rāgam system of Carnatic music and is the "prati madhyamam" equivalent of "Shoolini", which is the 35th "melakarta". It is called Kusumākaram in Muthuswami Dikshitar school of Carnatic music.