Airtel Super Singer 4 included a guest judge who was a veteran singer of what languages?
Airtel Super Singer 4:  To name a few- S. Janaki, M. S. Viswanathan, A. R. Rahman, P. Susheela, Asha Bhosle, S. P. Balasubrahmanyam, Vairamuthu, L. R. Eswari and Vani Jairam. L. R. Eswari:  She also sang in other languages like Hindi, Tulu, and English.
Hindi, Tulu, and English