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.
Pritam Pritam Chakraborty (Bengali: প্রীতম চক্রবর্ত্তী ) (born 14 June 1971), better known by the mononym Pritam, is an Indian music director, composer, singer, instrumentalist and record producer for Bollywood films. In a career spanning nearly one and a half decades, Pritam has composed musical numbers (songs) for more than a hundred Bollywood movies. He has won 3 Filmfare Awards, 4 Zee Cine Awards, 3 Star Screen Awards, 3 IIFA Awards and 3 ITA Awards among many others.