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.
Chaani Chaani is a 1977 Bollywood film directed by Rajaram Vankudre Shantaram. The songs in this film are written by renowned Marathi poet Mr. Chintamani Tryambak Khanolkar under pseudonym Arti Prabhu.