First appeared in www.scroll.in on August 1, 2015. Vilayat Hussein Khan, revered guru from the Agra gharana, taught several vocalists, many of who were well-known performers who did not belong to his family. Evidently, he was generous in imparting knowledge that he had assimilated from several eminent musicians. Last week, this column featured some 78 rpm and 45 rpm discs that Vilayat Hussein Khan recorded between the 1930s and the 1960s. Some of his recordings made by the All