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.
Antara Chowdhury Antara Chowdhury is a singer and composer of Bengali songs. She is a daughter of composer and lyricist Salil Chowdhury and Sabita Chowdhury. Antara started her singing career at the age of seven. She studied at the Bengal Music College, a music training college affiliated with the University of Calcutta. Her Bengali nursery songs are extremely popular among children of Bengal. She has numerous children's and contemporary hits to her credit in many Indian languages including Bengali, Hindi, Tamil and Malayalam.