Question: Who composed the soundtrack for T.M. Karthik's debut film?

Context paragraphs:
Panju (actor): Panju's debut film as hero, "Geetha bangle store" was released on 11 September 2015 and received a good response.  he is currently playing karthik role in Sanju mattu Naanu

Agni Natchathiram: Agni Natchathiram (English: "Star of Fire" ) is a 1988 Indian Tamil-language action drama film directed by Mani Ratnam.  The film is about two half-brothers who come into conflict with each other in their claim for legitimacy as sons of a common father.  Prabhu and Karthik played the lead roles along with Amala and Nirosha as their pairs.  This film marks the debut film for Nirosha.  The film's score and soundtrack composed by Ilaiyaraaja was well received.  The film was a blockbuster and completed a 200-day run at the box office.

Karthik Calling Karthik: Karthik Calling Karthik is a 2010 Indian psychological thriller film, written and directed by Vijay Lalwani and produced by Farhan Akhtar and Ritesh Sidhwani under the banner of Excel Entertainment and Reliance Big Pictures.  The film stars Farhan Akhtar and Deepika Padukone in lead roles.  Ram Kapoor and Shefali Shah play supporting roles in the film.  The film's music was composed by the trio of Shankar-Ehsaan-Loy, while the background score was composed by MIDIval Punditz and Karsh Kale.

T. M. Karthik: T. M. Karthik is a stage and film actor who acted in stage plays and feature films.  He made his acting debut in films with "Guru" (2007).

Maa Madurai: Maa Madurai is a Tamil film directed by newcomer K. K. Krishnan.  The film stars Vaasan Karthik, son of comedian Singamuthu and Midhuna, younger sister of Rajashree in lead roles.  The music was composed by Karthik Raja.  The film was released in 2007 to mixed reviews.

Chennai 600028: Chennai 600028 is a 2007 Tamil coming-of-age sports comedy film written and directed by Venkat Prabhu, in his directorial debut.  The film stars Jai, Shiva, Premji Amaran, Aravind Akash, Nithin Sathya and newcomers Ajay Raj, Ranjith, Vijay Vasanth, Prasanna, Inigo, Karthik and Arun in the lead along with Vijayalakshmi, daughter of National Film Award-winning director Agathiyan, and Kristine Zedek, making their acting debut as well.  The film was produced by S. P. B. Charan along with J. K. Saravana, a Singapore-based award-winning producer.  The film's score and soundtrack were composed by Premji Amaran and Yuvan Shankar Raja, respectively.

Dhanish Karthik: Dhanish Karthik (born 24 July 1989) is an Indian actor.  He made his debut as Sanjeev Menon in the Malayalam film "Ivide" (2015) directed by Shyamaprasad.  He recently finished filming for the Bollywood film Chef (2017 film) with Saif Ali Khan.  The film, directed by Raja Krishna Menon, is slated to release in July 2017.  This will be Karthik's debut in Bollywood.

Kadal (2013 film): Kadal (English: "The Sea" ) is a 2013 Indian Tamil crime-drama film co-written, co-produced and directed by Mani Ratnam.  The film features debutantes Gautham Karthik, son of actor Karthik, and Thulasi Nair, daughter of Radha, in the lead roles, with Arjun Sarja and Aravind Swamy in supporting roles.  The music was composed by A. R. Rahman.  The film revolves around life of Christian fishermen who instill the fact that how faith can sometimes lead to the triumph of humanity.  The film was dubbed into Telugu as "Kadali".  The film was released worldwide on 1 February 2013 in both the versions.

Karthikeya (film): Karthikeya is a 2014 bilingual mystery thriller written & directed by Chandoo Mondeti shot in Telugu & Tamil languages simultaneously.  It was produced by Venkat Srinivas on Magnus Cine Prime Pvt. Ltd. and featured Nikhil Siddharth, Swati Reddy, Tanikella Bharani and Rao Ramesh in important roles.  Shekhar Chandra composed the film's music while Karthik Ghattamaneni and Karthika Srinivas were its cinematographer and editor respectively.  The film revolves around a closed Kartikeya temple on the border of Andhra Pradesh and Tamil Nadu and showcases the life of a curious medico Karthik and his nexus with the temple.

Guru (2007 film): Guru is a 2007 Indian drama film loosely based on the life of Dhirubhai Ambani, a business magnate who founded Reliance Industries.  The film was co-written and directed by Mani Ratnam.  It stars Abhishek Bachchan, Aishwarya Rai, R. Madhavan, Vidya Balan, Arya Babbar, and Mithun Chakraborty in the leading roles.  The film also has Mallika Sherawat in a guest appearance.  The score and soundtrack for the film was composed by A. R. Rahman.  The film was dubbed and released simultaneously in Tamil as "Guru" and in Telugu as "Gurukanth".  In the Tamil version of the film, the lead role (Abhishek Bachchan) was dubbed by Suriya.  The film was released on 12 January 2007 with its première at the Elgin Theatre in Toronto, Canada, on Thursday 11 January 2007, making it the first Indian film to have a mainstream international première in Canada.  The film was premiered in the Tous Les Cinemas du Monde (World Cinema) section of 2007 Cannes Film Festival.

Supporting paragraphs: T. M. Karthik Guru (2007 film)
Answer: A. R. Rahman