Mysuru: Vidwan Praveen D. Rao said that senior Sugama Sangeetha singer H.R. Leelavathi, who has been singing for over four decades, is the Pole Star (Dhruva Taare) of Sugama Sangeetha field. He was speaking at the valedictory of the four-day ‘Nalavattara Nalivu,’ organised by Sugama Sangeetha Academy Trust, in association with Kannada and Culture Department,…