"It's a Great Day for the Irish" is an Irish-American song that was written in 1940 by Roger Edens, one of the many musical directors at the Metro-Goldwyn-Mayer studios under the leadership of Arthur Freed for inclusion in the film version of the George M. Cohan 1922 Broadway show Little Nellie Kelly, directed by Norman Taurog. The rights of the show were sold to MGM by Cohan as a starring vehicle for Judy Garland. The song was partly written to capitalize on Garland's identification with her Irish roots (Garland was a quarter Irish through her maternal grandmother Eva Fitzpatrick). The new song was to be used in a recreation of New York's famed annual St. Patrick's Day Parade marching up Fifth Avenue. It was to be a major production number requiring the New York Street set on the backlot to be enlarged, involving the main characters of the film and showcasing Garland's enormously strong voice and engaging performance style as she sang and danced up the avenue with her father, played by George Murphy, her stereotypical grandfather (played by Charles Winninger) and her boyfriend (Douglas McPhail). The movie was well received, but is now most remembered for the rousing song it introduced into Irish-American culture and as Garland's only death scene on film.
The song was originally recorded by Garland on Decca Records in 1940 as a single with another song from the film, "A Pretty Girl Milking Her Cow", on the B-side. The song was a tremendous hit for her and the original Decca version has remained in the catalogue since the 1940s. It was recorded several more times throughout her career with the last time being at the "London Sessions" under the musical direction of Norrie Paramor for Capitol Records in 1960. She often sang it live, particularly in concerts in Ireland and the UK where audiences clapped, sang along and danced in the aisles. During her famed Amsterdam, the Netherlands concert the audience stomped their feet and demanded the song to which Garland giggled and replied "well okay - its very loud" One particular review of a show wrote, "she shook the walls with her raucous rendition". The lively song included a special verse of difficult tongue-twisting rhyming Irish surnames and places, that seemed to thunder from Garland's throat effortlessly. The song was popular on jukeboxes in Irish Pubs and was recorded by numerous other Irish artists such as: Carmel Quinn, Bing Crosby, Ruby Murray, Daniel O'Donnell and The Clancy Brothers among others. Italian-American singer Connie Francis also recorded the song.