Na Casaidigh or The Cassidys are an Irish traditional group. They have been based in Dublin for many years, but they originally hail from Gweedore, County Donegal. The group consists of brothers Aongus, Seathrun, Ciaran, Fionntan, Feargus, and Odhran. Irish is their native tongue and they had to study English as a second language during their school years. The brothers' music has attracted worldwide attention and brought them to audiences from Togo in West Africa to Carnegie Hall in New York City.