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? 
Sentence (from "Jaideva Singh"): Jaideva Singh (19 September 1893 in Shoratgarh, Uttar Pradesh – 27 May 1986 in Banaras) was an Indian musicologist and philosopher.
Relevant evidence: Yes