Sishtla Sreeramamurthy Janaki, (తెలుగు : ఎస్.జానకి), (தமிழ் : எஸ்.ஜானகி), (മലയാലം : എസ്.ജനകി), (ಕನ್ನಡ : ಎಸ್.ಜಾನಕಿ) (born 23 April 1938), commonly known as S. Janaki, is a versatile Indian Playback singer.As of 2007 Janaki had sung nearly 40,000 songs, encompassing most of the languages of South India, during a career that has lasted over 50 years.