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.
Chaitanya Mahaprabhu Chaitanya Mahaprabhu ((also transliterated Caitanya Mahāprabhu); 18 February 1486 – 14 June 1534) was a spiritual leader who founded Gaudiya Vaishnavism. He is believed by some of his devotees to be Krishna himself who appeared in the form of His own devotee in order to teach the people of this world the process of Bhakti and how to attain the perfection in life. He is considered as the most merciful manifestation of Krishna . Chaitanya was the proponent for the Vaishnava school of Bhakti yoga (meaning loving devotion to God), based on "Bhagavata Purana" and "Bhagavad Gita". Of various incarnations of Vishnu, he is revered as Krishna, popularised the chanting of the "Hare Krishna" mantra and composed the "Siksastakam" (eight devotional prayers) in Sanskrit. His followers, Gaudiya Vaishnavas, revere him as a Krishna with the mood and complexion of his source of inspiration Radha. His birthday is celebrated as Gaura-purnima.