Question: Who was the tutor of the Carmatic vocalist with which Anil Srinivasan was well known for collaborating?

Context paragraphs:
Sikkil Gurucharan: Sikkil C. Gurucharan (born on 21 June 1982) is among the foremost young performing musicians of Carnatic music in India today.  He is the grandson of Sikkil Kunjumani, elder of the internationally acclaimed flautists the Sikkil Sisters.  Gurucharan has been under the tutelage Vaigal Shri S. Gnanaskandan and is currently being mentored by Shri B. Krishnamurthy.  He is an 'A' grade All India Radio artist.  The magazine India Today featured him among 35 Game Changers Under (the age of) 35 in India, a list of young achievers from different walks of life.

Spirits in Bondage: Spirits in Bondage (1919) was C. S. Lewis's first published work (originally published under the pseudonym Clive Hamilton, which is Lewis' first name followed by his mother's maiden name).  Lewis was twenty years old and had just returned from military service in the First World War.  His tutor, William T. Kirkpatrick, encouraged him in publishing the book, although it was unusual at Lewis's age, as writers were expected to wait longer before sharing their work with the world.  The book is subtitled A Cycle of Lyrics and is composed of three different sections of poetry.  The poems take on several styles and rhythms throughout the book, but share common themes.  This work stands out among Lewis's writings not only because of the focus on poetry rather than prose, but because the author had not yet made his conversion to Christianity; therefore the themes and worldviews offered in Spirits in Bondage differ greatly from those for which Lewis is most well known.  The book received no reviews and its reception was a slight disappointment for Lewis.

Arthur Nielsen (painter): Arthur Nielsen (1883–1946) is a listed and very well known Danish artist .  His tutor was Henrik Dohm (from 1909–1911).  He studied and traveled in Germany, Austria and Italy .  Arthur Nielsen was a co-founder of the Association of the Deer Park artists in 1913 .

William T. Kirkpatrick: William Thompson Kirkpatrick (10 January 1848 - 22 March 1921) was an Irish teacher and grammar school headmaster.  He is best known for having been the tutor of the two Lewis brothers from Belfast, Warnie Lewis and C.S. Lewis.  C.S. Lewis, who would later become well known as a literary critic, novelist, and Christian apologist, lived as a resident pupil with Kirkpatrick from 1914-1917.  In his autobiography, Lewis reports that he was significantly influenced by his tutor.

Sandra Madgwick: Sandra Madgwick Crossley (born in 1963) is a retired English ballerina and former principal dancer at the Birmingham Royal Ballet, where she worked for 19 years.  She initially trained at the Royal Ballet School and took over extensive roles both at the Birmingham Royal Ballet and at the Royal Opera House, Covent Garden appearing in works such as The Nutcracker, The Two Pigeons, Coppélia, Les Patineurs, and Carmina Burana.  She is well known for the role of Clara in the recorded and live-aired performance of 'The Nutcracker' in 1994.  Her other recorded works include the studio-recorded performance of Hobson's Choice (1992), in which she starred as Hobson's daughter Vicky.  She holds a master's degree in Dance in Education and the Community and is currently ballet tutor at Performers College and Dance East.  She is married and has three sons.

P. K. Srinivasan: P.K. Srinivasan (PKS) (November 4, 1924 – June 20, 2005) was a well known mathematics teacher in India.  He taught mathematics at the Muthialpet High School in Chennai, India until his retirement.  His singular dedication to education of mathematics would bring him to the United States, where he worked for a year, and then to Nigeria, where he would work for six years.  He is known in India for his dedication to teaching mathematics and in creating pioneering awareness of the Indian mathematician Ramanujan.  He has authored several books in English, Telugu and Tamil that introduce mathematics to children in novel and interesting ways.  He was also a prominent reviewer of math books in the weekly "Book Review" column of the Indian newspaper The Hindu in Chennai.

Anil Srinivasan: Anil Srinivasan (born June 3, 1977) is a classical pianist from India.  Born in Chennai, India and educated at the University of Southern California and at Columbia University, New York, he is well known for his collaborative work with Carnatic vocalist Sikkil Gurucharan.  Equally known is his pioneering work in music education in South India.

Maurice Henry Pappworth: Maurice Henry Pappworth (9 January 1910 – 12 October 1994) was a pioneering British medical ethicist and tutor, best known for his 1967 book "Human Guinea Pigs", which exposed the unethical dimensions of medical research.  Born and educated in Liverpool, Pappworth graduated as a Bachelor of Medicine, Bachelor of Surgery in 1932 from Liverpool University.  After working in a series of junior medical positions, his applications for more senior posts were rejected because of his Jewish parentage.  In the Second World War he served in the Royal Army Medical Corps.  Having been unsuccessful in achieving a post in any well known London hospital after the war, he set up in London as an independent medical consultant and tutor.

Pierre Colas: Pierre Robert Colas (January 13, 1976 – August 26, 2008) was a German anthropologist, archaeologist and epigrapher.  As a Mayanist scholar who investigated the pre-Columbian Maya civilization of ancient Mesoamerica, Colas was well known for his contributions to the study of the Maya writing system, and his archaeological work on cave sites used by the Maya.  His analysis of onomastics—personal naming practices and titles of rank—in Classic-era Maya inscriptions was the first major publication of its kind.  Colas also conducted ethnographic studies and surveys among contemporary Maya communities living in Belize.  In Europe, he had close involvement with the organisation of academic conferences and workshops on the Maya, as a workshop tutor, presenter of original papers, and editor of several conference proceedings and reports.

Andy Rantzen: Andrew (Andy) Rantzen is a Sydney-based lo-fi electronic recording artist and writer.  Trained as a psychologist, he has been lecturer and tutor at the University of Sydney.  He is most well known as part of the duo

Supporting paragraphs: Anil Srinivasan Sikkil Gurucharan
Answer: Vaigal Shri S. Gnanaskandan