Question: What song was sung by Arijit Singh in the 2016 Indian romantic drama film written and directed by Karan Johar?

full_context: Document 1: Befikre: Befikre (English: "Carefree" ) is a 2016 Indian romantic-comedy drama film written, directed, and produced by Aditya Chopra under his Yash Raj Films banner. It features Ranveer Singh and Vaani Kapoor in the lead roles. The film was shot over a period of 50 days in Paris and Mumbai. It released worldwide on 9 December 2016 to mixed reviews.
Document 2: Kabhi Alvida Naa Kehna: Kabhi Alvida Naa Kehna (English: "Never Say Good Bye"), also known as KANK, is a 2006 Indian musical romantic drama film directed by Karan Johar and produced under the Dharma Productions banner. Released on 11 August 2006 in India and North America, it stars Shah Rukh Khan, Rani Mukherji, Abhishek Bachchan and Preity Zinta in the lead roles, while Amitabh Bachchan and Kirron Kher play pivotal supporting roles. Arjun Rampal also makes a special appearance in the film.
Document 3: Soch Na Sake: "Soch Na Sake" (English: ""Can't think of"") is a song from the 2016 Indian film "Airlift", an adapted version of Hardy Sandhu's ""Soch"", sung by Amaal Mallik, Arijit Singh and Tulsi Kumar. The lyrics for the song is written by Kumaar and the music is composed by Amaal Mallik. The song is a melodious mixture of Hindi and Punjabi lyrics. There is also a solo version of the song, sung by Arijit Singh.
Document 4: Amit Mishra (singer): Amit Mishra is an Indian singer, songwriter, voice actor and live performer. He became more well-known after the release of the song "Bulleya" sung by him from the film Ae Dil Hai Mushkil; for his rendition of the song he won a Filmfare Award for new music talent, Screen Award for Best Male Playback and IIFA Award for Best Male Playback. He got nominated for the same song in different award shows. He has also sung in some of Telugu, Bengali and Marathi films.
Document 5: Chaiyya Chaiyya: "Chaiyya Chaiyya" (English: [walk] in shade ) is an Indian song from the 1998 Hindi film "Dil Se.." directed by Mani Ratnam. The song was composed by A.R. Rahman, written by Gulzar, and sung by Sukhwinder Singh and Sapna Awasthi. It quickly became popular upon the release and its music video gained cult status, partly because it was filmed on a moving train. The Tamil version is called "Thaiyya Thaiyya", which was also popular among Tamils.
Document 6: Dil: Dil (translation: "Heart") is a 1990 Indian Hindi-language romantic drama film, starring Aamir Khan, Madhuri Dixit, Anupam Kher and Saeed Jaffrey. It was directed by Indra Kumar, written by Naushir Khatau and Kamlesh Pandey, and with music composed by Anand-Milind. Dixit received the Filmfare Award for Best Actress for her performance. The film was remade in Telugu in 1993 under the title "Tholi Muddhu", starring Divya Bharti and Prashanth; it was also remade in Bangladesh in 1997 under the title "Amar Ghor Amar Beheshto" directed by "Sohanur Rahman Sohan" starring "Shakil Khan" , "Popy, Ahmed Sharif, Tarik Anam Khan". The film was also remade in Kannada as "Shivaranjini".
Document 7: Dil Chahta Hai: Dil Chahta Hai (English: "The Heart Desires") is a 2001 Indian comedy-drama film starring Aamir Khan, Saif Ali Khan, Akshaye Khanna, Preity Zinta, Sonali Kulkarni, and Dimple Kapadia. The first film written and directed by Farhan Akhtar, it is set in modern-day urban Mumbai and Sydney, and focuses on a major period of transition in the lives of three young friends.
Document 8: Aashiqui 2 (soundtrack): Aashiqui 2 is the soundtrack to the 2013 Bollywood romance film of the same name, directed by Mohit Suri and starring Aditya Roy Kapoor and Shraddha Kapoor in the lead roles. The album was produced by Bhushan Kumar and Mahesh Bhatt under the banner T-Series and Vishesh Films. the songs of the film were mostly composed by Jeet Gannguli, although Mithoon and Ankit Tiwari composed two songs each (including both versions) as guest composers. Irshad Kamil wrote lyrics for most of songs on the album. Sandeep Nath wrote both versions of "Sunn Raha Hai", while Mithoon wrote "Tum Hi Ho" and Sanjay Masoom wrote "Bhula Dena". Arijit Singh sang six of the songs on the album. The music became very popular after its release on 8 April 2013, with songs "Tum Hi Ho" and "Sunn Raha Hai" topping the charts across various platforms in India. Jeet Gannguli reused the tune from his own Bengali composition "Mon Hariye Beghorey" for "Milne Hai Mujhse Aayi".
Document 9: Dil Se..: Dil Se (translation: "From the Heart)" is a 1998 Indian romantic thriller film in the backdrop of insurgency in Northeast India, written and directed by Mani Ratnam, and produced by Mani Ratnam, Ram Gopal Varma, and Shekhar Kapur. The film stars Shahrukh Khan and Manisha Koirala in lead roles while Preity Zinta (in her film debut) appears in a supporting role. Mani Ratnam also co-wrote the screenplay for the film with Tigmanshu Dhulia. It is the third in Ratnam's trilogy of terror films after "Roja" and "Bombay". An example of parallel cinema tackling difficult subjects, to be found in director Ratnam's wider body of work as well, the film received a special mention at the Netpac Awards.
Document 10: Ae Dil Hai Mushkil: Ae Dil Hai Mushkil (English: "This Heart is Complicated" ) is a 2016 Indian romantic drama film written and directed by Karan Johar. It features Ranbir Kapoor, Anushka Sharma and Aishwarya Rai Bachchan in lead roles. It was released on 28 October 2016 on the Diwali weekend.
Document 11: Chashma Yaar Ka: Chashma Yaar Ka is a music album composed, written and sung by Gurmeet Ram Rahim Singh, the leader of Dera Sacha Sauda, a spiritual organization. The album was released on August 2012. It is Singh's third album. The album is a fusion of modern music and spirituality.
Document 12: Ae Dil Hai Mushkil (song): "Ae Dil Hai Mushkil" (English: "This Heart is Complicated") is a Hindi song from the soundtrack of the Indian film "Ae Dil Hai Mushkil". It is written by Amitabh Bhattacharya, composed by Pritam and sung by Arijit Singh. The music video of the song is picturised on actor Ranbir Kapoor.
Document 13: Muskurane: "Muskurane" (English: Smile) is a romantic Hindi song from the 2014 Bollywood film, "CityLights". Composed by Jeet Ganguly, the song is sung by Arijit Singh, with lyrics penned by Rashmi Singh. The music video of the track features actors Rajkummar Rao, Patralekha and Arijit Singh.
Document 14: Amitabh Bhattacharya: Amitabh Bhattacharya is an Indian lyricist and playback singer of Bengali origin from Uttar Pradesh who works in Bollywood films. He shot to fame with the film "Dev.D" with the song "Emotional Attyachar" turning an instant hit. He has been continuously writing lyrics for a variety of Bollywood movies since then and has also sung a few of them. Bhattacharya has also maintained a close association with Amit Trivedi since their first film "Aamir". He has written the lyrics or sang for most of the film albums composed by the latter. His lyrics have been variously described as "frillfree" and "smartly worded".
Document 15: Channa Mereya: "Channa Mereya" (English: "The light of my soul") is a song from the Indian film "Ae Dil Hai Mushkil". The song is penned by Amitabh Bhattacharya, composed by Pritam and sung by Arijit Singh. It was released on 29 September 2016 by Sony Music India.
ground_truth: Channa Mereya