Traditional works refer to music which was probably collectively composed by a group of people, normally without formal music training, and passed on orally from one generation to the next. The exact origin of works regarded as ‘traditional’ is often unknown and is usually undocumented/unpublished in manuscripts/sheet music dating from the time of composition, which in turn is often not precisely known. This particularly refers to folk, ethnic, indigenous or native music, such as folk-songs and folk-dances, which are sometimes referred to as ‘world music’.