Which South Indian poet and composer has a school of music where Sooryakantam  is called Chāyāvati ?
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. His compositions, of which around 500 are commonly known, are noted for their contemplative nature and for capturing the essence of the raga forms through the vainika (veena) style that emphasises gamakas. They are typically in a slower speed (chowka kala). He is also known by his signature name of Guruguha which is also his mudra (can be found in every one of his songs). His compositions are widely sung and played in classical concerts of Carnatic music.
Rajkumar Bharathi Rajkumar Bharathi is a classical singer and music composer from India. He is the great grandson of the renaissance poet Subramanya Bharathi. Rajkumar is an Electronics and telecommunications engineer graduated from the prestigious College of Engineering, Guindy, Chennai. Rajkumar Bharathi a native of Chennai stands today as one of the most popular artists of his generation. He has also got a great following in the Indian state of Karnataka owing to his pleasing style of rendering "Dasara Padagalu".