Title: Billa (1980 film)
Content:  The film's original soundtrack was composed by M. S. Viswanathan, while the lyrics were written by Kannadasan. The song "Vethalayai Potendi" replaces "Khaike Paan Banaras Wala" from the 1978 Hindi original. That, and "My Name is Billa" attained popularity.
Title: Billa (2009 film)
Content:  Music of Billa was launched at a packed auditorium in Shilpakala Vedika on the night of 18 March 2009 with Dasari Narayana Rao, S. S. Rajamouli, V. V. Vinayak, Gopichand and Allu Arjun as guests. Dasari Narayana Rao launched the music. Mani Sharma composed music for the film and Lahari music bought audio rights. The song "My Name is Billa" was re-used by Sharma for the Tamil film Sura (2010) as "Naan Nadanthaal Adhiradi" and "Bommali " as "Thanjavoor Jillakkaari".
Title: Billa II (soundtrack)
Content:  Billa II is the soundtrack album, composed by Yuvan Shankar Raja, for the 2012 film of the same name, directed by Chakri Toleti that stars Ajith Kumar as the title character. The album consists of six tracks; five songs and a theme music track. Na. Muthukumar penned all lyrics for the songs.
Title: Billa II (soundtrack)
Content:  Although a new director (Chakri Toleti) was chosen to direct the prequel, Yuvan Shankar Raja, who had worked on the score of Billa (2007), was retained as the composer of Billa II, which became his fifth project starring Ajith Kumar. The soundtrack album was reported to feature six tracks, including one promotional video song. It consists of five songs and a theme music track, an altered version of the original 2007 Billa theme. Yuvan Shankar Raja had composed a sixth song for a belly dance sequence, which was not included in the soundtrack, but featured only in the film. Na. Muthukumar agreed to write the lyrics, replacing Pa. Vijay who had worked on Billa's lyrics. In a 
Title: Billa II
Content:  Yuvan Shankar Raja, who had also worked on the score of Billa (2007), composed the soundtrack and score of Billa II, becoming his fifth project starring Ajith Kumar. The album consists of six tracks, five songs and a theme music track. The producer however confirmed that the film would feature a sixth song, not included in the soundtrack that was composed for a belly dance sequence. Na. Muthukumar agreed to write the lyrics for the songs. In a departure from convention, the lyrics were penned first which were set to tunes later. The audio launch was initially to be released in mid-March 2012, but was then pushed to second week of April. Actor Rajinikanth was approached to unveil the soundtrack, 
Title: Billa (2007 film)
Content:  For the film's music and soundtrack, Vishnuvardhan renewed his previous association (Kurumbu, Arinthum Ariyamalum and Pattiyal) with Yuvan Shankar Raja. The soundtrack has six songs, and the lyrics were penned by Pa. Vijay. Since the film was a remake, two songs from the original soundtrack, composed by M. S. Viswanathan, were remixed and included in the soundtrack. The formal release of the soundtrack was held on 21 November 2007 at Hotel Residence Towers in Chennai. Yuvan Shankar Raja reused some of the background music of his previous ventures Kedi and Vallavan in Billa. The album achieved record audio sales. Sify reported that it took the "best ever audio opening" for an Ajith film and the second highest opening day sales recorded in 2007 after Sivaji: The Boss. Nearly 22,000 CDs and cassettes 
Title: Billa (1980 film)
Content:  Billa was remade again in 2007 under the same title by Vishnuvardhan, with Ajith Kumar portraying Billa. This remake featured remixes of the songs "Vethalayai Potendi" and "My Name is Billa". After its commercial success, Vishnuvardhan decided to launch a prequel – Billa II with Ajith Kumar reprising his role. But due to date issues, Vishnuvardhan left the project, leaving it to Chakri Toleti. The film was released on 13 July 2012.
Title: Billo (film)
Content:  Billo (ਬਿੱਲੋ, بلو) is a 1951 Punjabi, Pakistani film directed by Amjad Hussain and starring Darpan, M. Ismail, Nizam Din and Najma. Ghulam Ahmed Chishti composed the music with playback singers including Zubaida Khanum.This was the movie in which renowned music director Ghulam Ahmed Chishti introduced Zubaida Khanum into the Pakistan film industry.
Title: Billa (2007 film)
Content:  role of the comedian was tipped to go Vadivelu, after he received rave reviews for his comic chemistry in Chandramukhi with Rajinikanth. However, despite the reviews, Vishnuvardhan's regular pattern meant that the spotlight for a comedian would be limited. Santhanam replaced him. Another character artiste, Adithya, also signed up to be one of the members of the police troupe, as did Malayalam actor Rahman, who with Billa made his comeback into Tamil cinema. The item number danced by Helen in the original was originally given to Mumaith Khan, but was later changed to newcomer Rose Dawn, for unknown reasons. For 
Title: Billa Pandi
Content:  Billa Pandi, also spelled as Billa Paandi, is a 2018 Indian Tamil language romantic action drama film written and directed by Raj Sethupathy. The film stars R. K. Suresh, Chandini Tamilarasan, and Indhuja Ravichandran in the lead roles while Thambi Ramaiah, G. Marimuthu and Sangili Murugan play supportive roles. The music for the film is composed by Ilayavan while cinematography is handled by M Jeevan. A possible Hindi remake of the film was announced prior to the film's release during October 2018 and the remake rights were sold to Arihant, son of film producer Ashok Kumar with the remake is expected to go on floors from January 2019. The film was released on 6 November 2018 on the eve of Diwali. This film was average in the box office.

Question: Who was the composer of Billa?
Answer: Yuvan Shankar Raja.