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".