Question: Iarla Ó Lionáird sang "Casadh an tSugain" in a 2015 film based on a novel by what author?
Sentence (from "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.
Relevant evidence: Yes