Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Un canto a Galicia is 1972 album by Julio Iglesias. The song of the same name which is actually sung in the Galician language also known as Gallego, and it was one of Iglesias's best known hits which led to him being known all over Europe and one of the top three artists in Latin America by 1975. Billboard cites it as Iglesias's "first big sales success", and that he also recorded it in Japanese and German, with notable success in Europe, Japan and Mexico.