Every country has its own folk music, but the term has come to most often represent traditional English and American music passed down from generation to generation orally. Music from other nations generally fall under the World Music' banner, while Celtic Folk includes output from other parts of the British Isles. Folk and Celtic songs are most often backed by acoustic instruments. The genre experienced a huge boom on both sides of the Atlantic in the 1960s, with artists like Bob Dylan and Joan Baez introducing the folk music to a much younger, hipper audience.