Question: Airtel Super Singer 4 included a guest judge who was a veteran singer of what languages?

Context articles: Airtel Super Singer 4
Airtel Super Singer 2008
Airtel Super Singer 5
Airtel Super Singer 3
Airtel Super Singer 2006
L. R. Eswari
Vijay TV's Super Singer (TV series)
Super Singer Junior
Airtel Super Singer
Super Singer T20

Airtel Super Singer 4, the fourth season of the popular show "Airtel Super Singer", premiered on 4 February 2013.
 The show was a reality-based Indian singing competition in Tamil language that aired on STAR Vijay.
 It was designed to be a talent hunt to find the best voice of Tamil Nadu.
 Judges for the auditions were Ananth Vaidyanathan, S.P. Sailaja, Devan Ekambaram, Nithyasree Mahadevan, Mahathi, Pop Shalini, S. Sowmya, Mano (singer) and Malgudi Subha.
 Some of these judges along with other noted musicians reappeared as Guest judges.
 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.
 Judges for the main competition were Sujatha, Unnikrishnan and Srinivas.
 Ma Ka Pa Anand and Bhavana were the hosts for the show.
 The voice trainer was Ananth Vaidyanathan.
 The show aired weekdays from Monday to Friday at 9PM IST.
Airtel Super Singer 2008, the second season of the music competition reality show "Airtel Super Singer", premiered on July 7, 2008.
 Judges for the show were Sujatha, Unnikrishnan and Srinivas.
 Chinmayi was the host of the show until January 2009 and was followed by Malini Yugendran (Hayma Malini) and Yugendran Vasudevan Nair.
 The voice trainer was Ananth Vaidyanathan.
Airtel Super Singer 5 - "Thamizhagathil Brahmaanda Kuralukkaana Thedal", the fifth season of the "Airtel Super Singer" show, is a reality-based Indian singing competition in Tamil language that aired on Vijay TV.
 It was designed to be a talent hunt to find the best voice of Tamil Nadu.
 The show premiered on 2 June 2015, and episodes were telecast between Monday to Friday each week at 9:30pm.
 Persons above the age of 16 years were permitted to audition to showcase their talent on Vijay TV's platform.
Airtel Super Singer 3 - "Thamizhagathil Brahmaanda Kuralukkaana Thedal - Immurai Ulaga Alavil", the third season of the "Airtel Super Singer" show, was a reality-based Indian singing competition in Tamil language that aired on Vijay TV.
 It was designed to be a talent hunt to find the best voice of Tamil Nadu.
 The show premiered on 12 July 2010, and episodes were telecast between Monday to Thursday each week at 9:00pm.
 Persons above the age of 16 years were permitted to audition to showcase their talent on Vijay TV's platform.
Airtel Super Singer 2006 - "Thamizhagathil Brahmaanda Kuralukkaana Thedal", the first season of the Airtel Super Singer show and Vijay TV's Super Singer series, was a reality TV singing competition in the Tamil language that aired on Vijay TV.
 The show premiered on 28 April 2006, with episodes originally aired on Vijay TV on Friday and Saturday nights at 8:00pm.
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.
Vijay TV's Super Singer is a reality television-music competition series telecast on the Indian Tamil language TV channel, STAR Vijay (also known as Vijay TV).
 Originally airing as Airtel Super Singer in April 2006, the TV series has since adapted into various high level music competitions on Vijay TV, including Airtel Super Singer, Airtel Super Singer Junior, Airtel Super Singer T20, and Super Singer Celebrity Season.
"Super Singer Junior" – "Thamizhagathin Chellakuralukkana Thedal (the search for the sweet voice of Tamil Nadu)" – is a reality show hosted by Vijay TV, a popular Tamil channel of the Star Network, and sponsored by Bharti Airtel.
 It is a singing talent hunt for the children of age group 6–14.
 This is the junior version of the Airtel Super Singer show, which premiered in 2006.
 Auditions are held in various parts of Tamil Nadu, India.
 The show attracts many kids from all over the state and rigorous multi-level selection procedures are done in order to select the contestants for the competition.
Airtel Super Singer (subtitled "Thamizhagathin Brahmaanda kuralukkana Thedal" ,"the search for the greatest voice of Tamil Nadu") is a reality TV singing competition in the Tamil language that is sponsored by the mobile service provider Bharti Airtel.
 The show is televised in India on Vijay TV, and worldwide through partner broadcasting networks.
 The show, together with its spin-off editions such as Airtel Super Singer Junior, are part of Vijay TV's Super Singer TV series.
Super Singer T20 is a music competition reality show hosted by Vijay TV.
 Former contestants from previous seasons of the "Airtel Super Singer" and "Airtel Super Singer Junior" shows are divided into 6 teams.
 15 league matches are held where each team competes against the other five teams.
 4 teams are selected for the knockout semi-finals, before the remaining 2 teams compete against each other in the finals.