There are many great, happy Celtic songs. A good source is the Clancy Brothers who sing such standards as "Dicey Riley," Galway Races," "Bog Down in the Valley," "Gypsy Rover" "I'll tell my Ma," 'Brennan on the Moor" (song of a highwayman and a daring escape), "Big Strong Man," "Holy Ground" "Jolly Tinker" "Bold Thady Quill" and "Take her up to Monto" to name a few. Heck, even some of the songs were people "die" are pretty upbeat, such as "The Mermaid," and "Irish Rover" (a standard).