"Danny Boy" is a song built on the traditional Irish melody known as "Londonderry Air," with lyrics written by English lawyer and lyricist Frederic Weatherly. Weatherly originally wrote the words in 1910 and set them to a different tune, but in 1913 he received a copy of the "Londonderry Air" from his sister-in-law in America and found that his lyrics fit the melody with only minor adjustments. Published that year by Boosey and Co., the song quickly gained popularity and was first recorded in 1915 by the opera singer Ernestine Schumann-Heink. The lyrics, which take the form of a farewell addressed to someone named Danny, have been interpreted variously as a parent's lament for a son departing for war, a lover's plea, or a broader meditation on loss and separation. The melody's wide intervallic range and long, arching phrases give the song a quality of emotional expansiveness that has made it a vehicle for dramatic interpretation across many genres, from opera and choral music to folk, pop, and jazz. In jazz contexts, musicians typically treat the melody as a ballad feature, using its strong melodic identity as a framework for reharmonization and improvisation. "Danny Boy" is among the most widely performed songs of the twentieth century, a staple of Irish cultural occasions and a broadly recognized standard.