This tune was written as "Cau'l Chouzano" by Fernando Largo (1960 - 2010), who was a musician from San Xuan de BeleƱo in Asturia. Galicia is a Celtic area in Northwest Spain that lies to the west of Asturia.
This very possibly ancient tune is from Brittany, where it is named Dans En Dro after a type of dance that originated in the city of Vannes, located in the southern part of Lower Brittany.