Sistla Janaki is an Indian playback singer and occasional music composer. She is widely referred to as Janaki Amma and Nightingale of South India. She is one of the greatest playback singers in the history of Indian music. She has recorded over 48000 songs in films, albums, TV and Radio which includes solos, duets, chorus and title tracks in 20 Indian languages, including Telugu, Kannada, Malayalam, Tamil, Hindi, Sanskrit, Odia, Tulu, Urdu, Punjabi, Badaga, Bengali, Konkani, as well as in foreign languages such as English, Japanese, German and Sinhala. The language in which she sang the most songs in her career was Kannada, followed by Malayalam. She is widely acclaimed as the Queen of expression & modulation in any Language with Nativity.