Carnatic vocalist Radha Vishwanathan (83), daughter of M.S. Subbulakshmi, who accompanied the legendary queen of music for nearly 5 decades on stage has passed away. She was suffering from pneumonia for the last few weeks. She was the eldest daughter of Thiagarajan Sadasivam and his first wife, Apithakuchambal (alias Parvathi). However, she was brought up by M. S. Subbulakshmi whom her father married after the death of Apithakuchambal from a scorpion sting.