Airtel Super Singer 4 included a guest judge who was a veteran singer of what languages?
L. R. Eswari Lourde-Mary Rajeswari Eswari (L. R. Eswari) is a veteran playback singer of the Tamil cinema, Telugu cinema, Malayalam cinema and Kannada cinema industries. She also sang in other languages like Hindi, Tulu, and English.
Mridula Warrier Mridula Warrier (also known as Mridula Varier) is an Indian playback singer from Kerala. She started her career as a playback singer in the Malayalam movie "Big B" in 2007. She has also recorded songs for Tamil and Kannada films. She was the first runner-up of "Idea Star Singer" in 2010.