Where are Celtic songs most popular?

Celtic songs are primarily popular in the Celtic countries and regions, including Ireland, Scotland, Wales, Cornwall, Brittany, and the Isle of Man. This popularity is deeply rooted in the historical and cultural heritage of these areas, which have a rich tradition of Celtic music and culture. However, Celtic songs also enjoy a significant level of popularity in other parts of the world, particularly in regions with a strong Celtic diaspora or cultural influence, such as the United States, Canada, Australia, and New Zealand.