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? 
Related documents: [0]  [DOC] 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. [END] 
[1]  [DOC] 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those earlier times, the art had undergone several changes, rendering the raga "grammar" documented in scant old texts outdated. [END] 
Answer: 
Jaideva Singh
Jaideva Singh