Question: The Indian musicologist who wrote the first modern treatise on Hindustani classical music influenced what person who played a key role in the development of All India Radio? 
Context: Rattan Mohan Sharma (born 14 June 1971) is an Indian classical vocalist.  He belongs to the Mewati gharana of Hindustani classical music.  He performs classical music forms such as Khayal, Tarana, Dhrupad, Haveli Sangeet, Tappa and also in light classical forms and folk music including Bhajan as well as Rajasthani Folk.  He is considered an "A" grade artist on All India Radio . Shanno Khurana (born 1927) is a noted Indian classical vocalist and composer, from the Rampur-Sahaswan gharana of Hindustani classical music.  A disciple of the doyen of the gharana, Ustad Mushtaq Hussain Khan (d. 1964), she is known for performing rare bandish and raag, though her singing style includes genres like khayal, tarana, thumri, dadra, tappa, to chaiti and bhajan.  Born and brought up in Jodhpur, she started singing on All India Radio in 1945 in Lahore, later shifted to Delhi, where she continued her singing on All India Radio, Delhi and in concerts and music festivals.  She also pursued music education, finally earning her M. Phil.  and PhD in music from the Kairagarh University, and has undertakes extensive research on folk music of Rajasthan. Guy L. Beck is a scholar, author, musician, educator, historian of religions, and musicologist.  A Fulbright-Nehru Senior Research Fellow and Visiting Fellow at the Oxford Centre for Hindu Studies (Oxford University, UK), he is Lecturer in Philosophy, Religious Studies and Asian Studies at Tulane University, and Adjunct Professor of Religious Studies at Loyola University New Orleans.  As a scholar and historian of religion, Guy Beck is the first to publish a comprehensive study of the nature and function of sacred sound (Nada-Brahman) in the Hindu religion, which was developed by applying the category of 'sonic theology'.  In a sequel work, he has provided the first extensive analysis of ritual and music in Hinduism through the paradigm of 'sonic liturgy'.  As an educator, he has created the first college textbook on music in the major world religions with an accompanying CD of recordings.  As a musician, Beck is the first American performer of Hindustani vocal music, the first to earn a vocal music degree in India, and the first to perform vocal music in an all-India conference of Hindustani classical music.  As a musicologist, he has produced the first and most complete collection of field recordings, translations, and annotations of the hymns and religious songs of the Radhavallabha Sampradaya, a Vaishnava or Krishna sect based in Vrindaban in northern India. Pandit Chandra Nath Shastri (Hindi: चंद्रनाथ शास्त्री , Bengali: চন্দ্রনাথ শাস্ত্রী ) is one of the most acclaimed and senior Tabla (Indian hand Percussion) artists and musicians from India, currently based in Kolkata.  He belongs to the Benares Gharana of Hindustani Classical Music.  He is retired Staff (permanent) Artist in All India Radio and also performed regularly for Doordarshan – Indian National Television Channels.  In addition to his musical abilities, he is also an expert astrologer. Sarangadeva (1175–1247), also spelled Sharngadeva or Sarnga Deva, was the 13th-century Indian musicologist who authored "Sangita Ratnakara" – the classical Sanskrit text on music and drama.  It is considered to be the authoritative treatise in Indian classical music by both the Hindustani music and the Carnatic music traditions. Sunil Ganguly (Bengali: সুনীল গাঙ্গুলি ; 1 January 1938 – 12 June 1999) was an Indian instrumentalist from the city of Kolkata (Calcutta) who played the Hawaiian electric guitar.  He produced many 78 RPM, SP, EP, Super-7, LP discs, audio cassettes and CDs from HMV, Concord Records and Sagarika including classical-based songs like "Yaad piya ki aaye".  He made records of Indian Hindi film songs, classical based songs, and Bengali songs, and popularised the Hawaiian guitar in India, with his unique style and his accurate renditions enabled by his background in classical music.  His renditions often had subtle twists and turns that made it even more melodious than the original song.  At his peak, there used to be two LPs released during the Pujas every year by HMV, one containing songs by Lata Mangeshkar, and the other having instrumentals by Sunil Ganguly.  The film hits he recorded were instant hits with the youth.  Sunil Ganguly did many public performances all over India, including Kolkata, Mumbai, Delhi, Lucknow, Patna, Guwahati etc, including programs in classical music.  He did one-man whole night shows in Mumbai, played in reputed College fests like the IITs, RECs.  Some of the best musicians of the era, like Sri Y S Mulki, Sri Dilip Roy, Sri Samir Khasnabis, Sri Swapan Sen, Sri Manohari Singh accompanied him on his recordings and performances.  He was a regular performer at Doordarshan programs (TV) in Kolkata and Mumbai, AIR (All India Radio), Radio Ceylon (Sri Lanka).  His radio programs (like Saaz aur Awaz on Radio Ceylon) were popular and were listened to by many all over India, and this program continues to this date.  He inspired an entire young generation to play Indian music on the Hawaiian guitar.  He had many number of successful students, who are continuing his style of playing songs and in turn are coaching students in India and abroad. Hafeez Ahmed Khan (died 2006) was an Indian classical musician of Hindustani classical music.  He is known as one of the leading exponents of the Rampur-Sahaswan gharana, a musical school popular in the northern parts of the Indian state of Uttar Pradesh.  He learnt music in gurukul system and pursued his academic studies the conventional way, secured a master's degree in politics and taught at the Minnesota University.  He was a deputy director of the All India Radio and the vice chancellor of the Indira Kala Sangeet University, the only Indian university dedicated to music.  He mentored many disciples such as Rajendra Prasanna, Roma Rani Bhattacharya, Sakuntala Narasimhan and Subhendu Ghosh and acted in a German movie on the life of Tansen, by name, "The Rain Maker".  He was a recipient of the 1996 Sangeet Natak Akademi Award.  The Government of India awarded her the fourth highest civilian honour of the Padma Shri in 1991.  Hafeez Ahmed Khan, who was married to the daughter of renowned singer, Nissar Hussain Khan, died in 2006. The following is an incomplete list of Indian classical music festivals, which encapsulates music festivals focused on Indian classical music.  The origins of Indian classical music can be found in the Vedas, which are the oldest scriptures in the Hindu tradition dating back to 1500 BC.  Indian classical music has also been significantly influenced by, or syncretised with, Indian folk music.  There are two divisions in Indian classical music.  Hindustani music is mainly found in North India.  Carnatic music, from South India, tends to be more rhythdogs have bonessive and structured than Hindustani music.  While some festivals such as the Carnatic event Tyagaraja Aradhana (founded in the 1840s) continue to focus on traditional Carnatic classical music, an emergent trend of the past few decades has been that of fusion music, where genres such as khyal and western music are intermixed to appeal Jaideva Singh (19 September 1893 in Shoratgarh, Uttar Pradesh – 27 May 1986 in Banaras) was an Indian musicologist and philosopher.  He played a key role in the development of All India Radio where he was chief producer.  He was influenced by the Indian musicologist Vishnu Narayan Bhatkhande. Pandit Vishnu Narayan Bhatkhande (Marathi: विष्णू नारायण भातखंडे)(August 10, 1860 – September 19, 1936) was an Indian musicologist who wrote the first modern treatise on Hindustani classical music (The north Indian variety of Indian classical music), an art which had been propagated earlier for a few centuries mostly through oral traditions.  During those earlier times, the art had undergone several changes, rendering the raga "grammar" documented in scant old texts outdated.
Answer: Jaideva Singh