National Anthem: Northern Ireland - Danny Boy (Londonderry Air) - Constituent Country of the UK

The Londonderry Air is an air that originated from County Londonderry in Ireland (now in Northern Ireland). It is popular among the Irish diaspora and is very well known throughout the world. The tune is played as the victory anthem of Northern Ireland at the Commonwealth Games. The song "Danny Boy" uses the tune, with a set of lyrics written in the early 20th century.
nitially written to a tune other than "Londonderry Air", the words to "Danny Boy" were penned by English lawyer and lyricist Frederic Weatherly in Bath, Somerset in 1910. After his Irish-born sister-in-law Margaret (known as Jess) in the United States sent him a copy of "Londonderry Air" in 1913 (an alternative version has her singing the air to him in 1912 with different lyrics), Weatherly modified the lyrics of "Danny Boy" to fit the rhyme and meter of "Londonderry Air".

Weatherly gave the song to the vocalist Elsie Griffin, who made it one of the most popular songs in the new century; and, in 1915, Ernestine Schumann-Heink produced the first recording of "Danny Boy".

Jane Ross of Limavady is credited with collecting the melody of "Londonderry Air" in the mid-19th century from a musician she encountered.

"Danny Boy" is also considered to be an unofficial signature song and anthem, particularly by Irish Americans and Irish Canadians