Celtic folk music is the modern umbrella for living folk traditions that grew from the Celtic-speaking regions of Ireland, Scotland, Wales, Cornwall, the Isle of Man, Brittany (France), and the northwestern Iberian areas of Galicia, Asturias, and Cantabria, as well as Trás-os-Montes in Portugal.
It centers on modal melodies (often Dorian and Mixolydian), strong dance rhythms (reels, jigs, hornpipes, polkas, strathspeys), and richly ornamented tune-playing on fiddle, flutes and whistles, bagpipes (Uilleann and Highland), harp, accordion/concertina, and increasingly the Irish bouzouki and guitar. Vocal styles range from unaccompanied sean-nós and Gaelic ballads to chorus-led pub songs, with themes of landscape, seafaring, migration, love, labor, resistance, and communal memory.
Arrangements frequently present sets of tunes—several related dance airs played back-to-back at rising intensity—supported by drone textures, syncopated bodhrán patterns, and modal pedal points, creating a propulsive, earthy, and often celebratory sound.