Question: What instrument did one of George Harrison's fellow musician co-workers become well known for championing?
Sentence (from "Ravi Shankar"): Ravi Shankar, KBE (] ; 7 April 192011 December 2012), born Rabindra Shankar Chowdhury, his name often preceded by the title Pandit ('Master'), was a Bengali Indian musician and a composer of Hindustani classical music.
Relevant evidence: No