Question: Iarla Ó Lionáird sang "Casadh an tSugain" in a 2015 film based on a novel by what author?

full_context: Document 1: Glen Hansard: Glen Hansard (born 21 April 1970) is an Irish songwriter, actor, vocalist and guitarist for Irish group The Frames, and one half of folk rock duo The Swell Season. He is also known for his acting, having appeared in the BAFTA-winning film "The Commitments", as well as starring in the film "Once", which earned him a number of major awards, including an Academy Award for Best Song.
Document 2: Colm Mac Con Iomaire: Colm Mac Con Iomaire is an Irish musician from Blackrock, County Dublin. He plays violin and sings vocals with rock group The Frames. Mac Con Iomaire has been involved with The Frames since 1990 and has been a touring member of The Swell Season since 2006 (albums "Once" and "Strict Joy"). He also played violin on David Gray's 1998 album "White Ladder" (on the track "Silver Lining").
Document 3: Brooklyn (film): Brooklyn is a 2015 British-Canadian-Irish romantic drama film directed by John Crowley and written by Nick Hornby, based on Colm Tóibín's 2009 novel of the same name. The film stars Saoirse Ronan, Emory Cohen, Domhnall Gleeson, Jim Broadbent, and Julie Walters. Set in 1951 and 1952, the film tells the story of a young Irish woman's immigration to Brooklyn, where she falls in love. When her past catches up with her she must choose between two countries and the lives that exist within them for her.
Document 4: The Gloaming (group): The Gloaming is a contemporary Irish music supergroup formed in Ireland in 2011 consisting of musicians Martin Hayes, Iarla Ó Lionáird, Caoimhín Ó Raghallaigh, Dennis Cahill and New York pianist/producer Thomas Bartlett aka Doveman.
Document 5: Saoirse Ronan: Saoirse Úna Ronan ( ; born 12 April 1994) is an Irish and American actress. She is a two-time Academy Award nominee; receiving a Best Supporting Actress nomination for "Atonement" (2007), and a Best Actress nomination for "Brooklyn" (2015). She has also received three BAFTA Award nominations, two Golden Globe nominations, two Screen Actors Guild nominations and two Satellite Awards.
Document 6: List of accolades received by Brooklyn: Brooklyn is a 2015 Irish-Canadian historical period drama film directed by John Crowley. Writer Nick Hornby adapted the screenplay from Colm Tóibín's novel of the same name. The plot follows Eilis Lacey (Saoirse Ronan), a young Irish woman who emigrates to Brooklyn to find employment. There she marries an Italian plumber called Tony (Emory Cohen), before being forced to choose between her home town of Enniscorthy or her new life in Brooklyn. The film premiered at the 2015 Sundance Film Festival. It was released by Fox Searchlight Pictures in a limited capacity on 6 November 2015.
Document 7: Now (The Dubliners album): Now is an album by The Dubliners released in 1975. Following the departure of both Ciarán Bourke and Ronnie Drew in 1974, singer/guitarist Jim McCann joined Barney McKenna, Luke Kelly and John Sheahan as a member of The Dubliners to record this album, which Sheahan himself produced. The slight shift in personnel produced a more mellow sound. Arguably, McCann's greatest contribution to the album is the ballad "Carrickfergus", which became one of his most popular and requested songs. It also features a wonderful rendition of the English ballad, "The Unquiet Grave", performed by Luke Kelly.
Document 8: Carol (film): Carol is a 2015 British-American romantic drama film directed by Todd Haynes. The screenplay, written by Phyllis Nagy, is based on the 1952 romance novel "The Price of Salt" (also known as "Carol") by Patricia Highsmith. The film stars Cate Blanchett, Rooney Mara, Sarah Paulson, Jake Lacy, and Kyle Chandler. Set in New York City during the early 1950s, "Carol" tells the story of a forbidden affair between an aspiring female photographer and an older woman going through a difficult divorce.
Document 9: Love, Rosie (film): Love, Rosie is a 2014 British-German romantic comedy-drama film directed by and written by Juliette Towhidi, based on the 2004 novel "Where Rainbows End" by Irish author Cecelia Ahern. The film stars Lily Collins, Sam Claflin, Tamsin Egerton, Suki Waterhouse, Jaime Winstone and Lily Laight.
Document 10: 45 Years: 45 Years is a 2015 British romantic drama film directed and written by Andrew Haigh. The film is based on the short story "In Another Country" by David Constantine. The film was screened in the main competition section of the 65th Berlin International Film Festival. Charlotte Rampling won the Silver Bear for Best Actress and Tom Courtenay won the Silver Bear for Best Actor. At the 88th Academy Awards, Rampling received a nomination for Best Actress in a Leading Role.
Document 11: Jane Brennan: Jane Brennan is an Irish actress. Primarily known for her work on the stage, she played Mary Lacey in the Academy Award-nominated film "Brooklyn". She also had a recurring role as Lady Margaret Bryan on the series "The Tudors". She is the co-founder of the Bespoke Theatre Company.
Document 12: Room (2015 film): Room is a 2015 independent drama film directed by Lenny Abrahamson and written by Emma Donoghue, based on her novel of the same name. It stars Brie Larson as a woman who has been held captive for seven years, and whose 5-year-old son (Jacob Tremblay) was born in captivity. Their escape allows the boy to experience the outside world for the first time. The film also stars Joan Allen, Sean Bridgers, and William H. Macy.
Document 13: Lisa Kelly: Lisa Ann Kelly or Lisa Olivia Mary Sinead Kelly (Irish: Laoise Ní Cheallaigh, born May 7, 1977) is a singer of both classical and Celtic music. She has taken part in many musical theatre productions and concerts, and is a founding and former member of the musical group Celtic Woman.
Document 14: Sing Street: Sing Street is a 2016 musical coming-of-age comedy-drama film co-written, co-produced and directed by John Carney. Starring Ferdia Walsh-Peelo, Lucy Boynton, Maria Doyle Kennedy, Aiden Gillen, Jack Reynor, and Kelly Thornton, the story revolves around a boy starting a band to impress a girl in 1980s Ireland. It is an international co-production from Ireland, the United States, and United Kingdom.
Document 15: Iarla Ó Lionáird: Iarla Ó Lionáird (born 18 June 1964) is an Irish singer and record producer. He sings in the traditional sean-nós style. He was a member of the Afro Celt Sound System and is a member of the Irish-American supergroup The Gloaming. He has recorded several solo albums for Real World Records. He appeared in the 2015 film "Brooklyn" singing an a cappella version of the Irish folk song "Casadh an tSugain".
ground_truth: Colm Tóibín