Sistla Janaki is an Indian playback singer and occasional music composer from Andhra Pradesh. She is referred to respectfully as "Janaki Amma" and Nightingale of South India. She is one of the best-known playback singers in India. She is referred to as 'Isaikkuyil' in Tamil Nadu and 'Gaana Kogile' in Karnataka. She has recorded over 48,000 songs in films, albums, TV and Radio which includes solos, duets, chorus and title tracks in 17 languages including Telugu, Kannada, Tamil, Malayalam, Hindi, Sanskrit, Odia,Tulu, Urdu, Punjabi, Badaga, Bengali, Konkani and also in foreign languages such as English, Japanese, German, and Sinhala. However the highest number of songs in her career were in Kannada, followed by Malayalam. Starting in 1957 with the Tamil film Vidhiyin Vilayattu, her career has spanned over six decades.