This theme of the "Follies of Spain", also known as Follia (in Italian) or commonly called, Follies of Spain, appears in a Canarian dance, then in the Iberian Peninsula at the end of the Middle Ages, that is to say in the 15th century.
Built from an ostinato, or obstinate bass, the Folía is based on a harmonic sequence where a specific melody is drawn, its musical construction is repetitive and therefore conducive to variations.
The instrumental accompaniment of this dance was characterized by the use of sound instruments (such as the guitar and percussion). The term "folía" refers both to the song and to this dance full of joy, frenetic and "crazy".
Music supplants dance by transforming the Folía into a true instrumental work in its own right, allowing composers to shine their creativity by composing musical pages of great virtuosity, like Frescobaldi, Scarlatti, Bach, Corelli, etc., who take this theme to offer their own version.
