Question: Which South Indian poet and composer has a school of music where Sooryakantam  is called Chāyāvati ?
Context: The 1928 South Indian railway strike was a general strike by the South Indian Railway Workers Union against plans of the South Indian Railway Company to lay off over 3,100 workers in order to reduce the expenditures of the company.  The strike lasted from June 29 to August 2, 1928, and severely affected the transportation of people and goods across South India.  The Madras government and the South Indian Railway Company responded with a crackdown.  Most of the leaders of the strike were arrested and recognition to the union was withdrawn. Pulapaka Susheela, commonly known as P. Susheela, is an Indian playback singer associated with the South Indian cinema for over six decades.  She has been recognized by both the "Guinness Book of World Records" and the "Asia Book of Records" for singing most number of songs in Indian languages.  She is also the recipient of five National Film Award for Best Female Playback Singer and numerous state awards.  Susheela is widely acclaimed as a singer who defined feminism in South Indian Cinema and is well known for her mellifluous vocal performances for over 40,000 film songs across South Indian languages. South Indian culture refers to the culture of the South Indian states of Andhra Pradesh, Karnataka, Kerala, Tamil Nadu and telangan￼a and many.  South Indian culture though with its visible differences forms an important part of the Indian culture.  The South Indian Culture is essentially the celebration of the eternal universe through the celebration of the beauty of the body and motherhood.  It is exemplified through its dance, clothing, and sculptures. Kancharla Gopanna (Telugu: కంచర్ల గోపన్న ) (c 1620 – 1680), popularly known as Bhakta Ramadasu or Bhadrachala Ramadasu (Telugu: భద్రాచల రామదాసు ), was a 17th-century Indian devotee of Rama and a composer of Carnatic music.  He is one among the famous vaggeyakaras (a person who not only composes the lyrics but also sets them to music; vāk = word, speech; geya = singing, singable; geyakāra = singer) in the Telugu language.  Other famous "vaggeyakaras" in Telugu literature, including Annamayya, Tyagaraja, Kshetrayya, and Shyama Sastri.  He lived in the village of Nelakondapalli near Bhadrachalam, Telangana during the 16th century and is renowned for constructing a famous temple for Rama at Bhadrachalam.  His devotional lyrics to Rama are famous in South Indian classical music as "Ramadaasu Keertanalu".  Even the doyen of South Indian classical music Saint Tyagaraja learned his musical compositions.  He also wrote Dasarathi Shatakamu (దాశరథి శతకము) with a 'makuTamu' (మకుటము) 'Daasarathee Karunaa payonidhee' (దాశరథీ కరుణా పయోనిధీ!) , a collection of nearly 108 poems dedicated to the son of Dasaratha (Lord Rama). 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. Māri (/mɒrı/, /maari/, Tamil: மாரி ), also known as Mariamman ( /mɒrı əˈmʌn/ Tamil: மாரியம்மன் ) and Mariaai (Marathi: मरी आई), both meaning "Mother Mari", spelt also Maariamma (Tamil: மாரியம்மா ), or simply Amman or Aatha (Tamil: அம்மன் , "mother") is the South Indian Hindu goddess of rain.  She is the main South Indian mother goddess, predominant in the rural areas of Tamil Nadu, Thirucherai Māri is closely associated with the Hindu goddesses Parvati and Durga as well as with her North Indian counterpart Shitaladevi.  Goddess Mariamman is considered by many to be the South Indian Incarnation of Goodess Kali.  It is said that when Kali went to Southern India as Mariamman, Bhairava followed her as Madurai Veeran. Muthuswami Dikshitar 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.  His compositions are widely sung and played in classical concerts of Carnatic music. 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. The South Indian diaspora (Tamil: அயலகத் தென்னிந்தியர் ) comprises people who have emigrated from South Indian states to other Indian states and other countries, and people of South Indian descent born or residing in other Indian stats and other countries. To India - My Native Land is a poem composed by Indian poet Henry Louis Vivian Derozio in 1828.  It is one of the most notable works by the Indian poet.
Answer: Muthuswami Dikshitar