http://www.elalmanaque.com/diciembre/28-12-poe.htm

¡Viva Don Gato! Imagine my surprise in 1987 in Barcelona when a Catalonian friend began to sing "Vamos a contar mentiras" ( Let's Tell Lies") to the tune of my beloved childhood "Don Gato." It seems our Don Gato got the lyrics & plot from one traditional song and the tune from a completely separate one, having nothing to do with cats.