Brooklyn, the critically acclaimed new film starring Saoirse Ronan, features an evocative soundtrack that recreates the pre-rock and roll ambiance of 1950’s Ireland and the United States.

But Irish emigrants will be especially moved by the acappella version of the Irish folk song 'Casadh an tSugain' sung by Iarla Ó Lionáird at a key point in the film.

In Brooklyn Ronan’s character Eilis, deeply homesick for Ireland, is brought to tears by a working man’s rendition of the haunting song and with one listen you’ll understand why.

Today is offering a world exclusive premiere of the track, included in the Brooklyn soundtrack which goes on sale on December 4.

Brooklyn, directed by John Crowley, tells the deeply moving story of Eilis Lacey (Saoirse Ronan), a young Irish immigrant navigating her way through 1950s Brooklyn. Lured by the promise of America, she leaves Ireland and the comfort of her mother’s home for the shores of New York City.

“Everyone has a favourite film moment and it's invariably accompanied by music,” added director John Crowley. The film’s music coordinator John Carty agrees: “In ‘Brooklyn’ the songs and tracks journey from the more traditional fare of an Enniscorthy dance hall all the way across the Atlantic to Coney Island where the sights and sounds of emerging pop culture in fifties America fill the screen. Each one marks a subtle shift in our heroine’s journey. For Eilis, it's a long way from Boolavogue to Bing Crosby...”

The album will be released digitally by Lakeshore Records on December 4. Listen to Casadh an tSugain sung by Iarla Ó Lionáird here: