Mysore/Mysuru: Dr. N.C. Rangacharyulu, a legendary Karnatak vocalist and a torch-bearer of Indian classical music from Hyderabad, will be presenting two vocal concerts in city this week:  On May 6, at Veene Seshanna Bhavana in Kuvempunagar, his concert will start at 6 pm. He will be accompanied by Vid. T.K.V. Ramanujacharyulu on violin, Vid. Mysore…