Folia is a very old song. 
Folia is a very old musical theme. 

La Folia is a very old musical theme. 

There are two main types of Folia. The early version is a fast dance. It may have started in the 1400s. It might come from Portugal or Spain. The later version is more famous. It uses a set pattern of chords. This pattern stays the same. A composer named Jean-Baptiste Lully helped make this version standard. It often starts and ends with the same slow melody. This acts like bookends for the music. 
Many great musicians have used this theme. More than 150 composers have used it. Famous names include Handel, Bach, and Vivaldi. Even Beethoven used it in his Fifth Symphony.
La Folia is a very famous musical theme from Europe. It is one of the oldest pieces of music ever recorded. People call it by many different names depending on where they live. In France, it is known as Folies d'Espagne. In Italy, people call it La Follia. 
There are two main ways to play a Folia. The early version is a fast dance. It does not always use the same set of chords. Instead, it uses a special way of making music through improvisation. This means musicians make up parts of the music as they go. 

Historians are still studying where the Folia first began. Some think it started as a dance in the 1400s. It might have come from Portugal or the Iberian Peninsula. It could also have started in the Kingdom of Valencia. 
Many famous composers have used the later Folia in their music. Jean-Baptiste Lully helped make the standard chord pattern famous. He wrote an arrangement for Louis XIV in 1670. 
You can hear the influence of the Folia in many places today. It even shows up in old Swedish folk tunes. Some people say half of those old tunes use the Folia structure.
La Folia is one of the oldest musical themes ever recorded in European history. It serves as a primary melodic material that composers use to build complex musical works. Depending on the language, it is known as Folies d'Espagne in French, La Follia in Italian, or Follies in English. This musical idea is much more than a simple tune. It acts as a structural foundation that allows musicians to explore many different styles and emotions. Over three centuries, more than 150 different composers have used this theme in their own compositions. 
Music historians identify two distinct versions of this theme: the early folia and the later folia. The early folia is generally faster and more varied in its form. Recent research suggests that the early version was not a fixed sequence of chords. Instead, it was a compositional and improvisational method applied to simple melodies in a minor mode. This process allowed musicians to generate their own unique sequences of chords through improvisation. 
The later folia is the more widely recognized version used in classical music. This version is characterized by a fixed chord progression, which is a set sequence of musical harmonies. It usually begins with a slow melody in triple meter, a rhythm known as a sarabande. This initial theme often serves as "bookends," appearing at both the start and the end of a piece. Between these bookends, the composer creates many variations. During these variations, the melody and even the meter can change significantly. 
To understand the mechanism of the later folia, one must look at its 16-bar chord progression. In the common key of G minor, the progression follows a specific mathematical pattern. It moves through chords such as G minor, D7, F, and Bb. This structure provides a predictable framework for the musician. The progression typically features one chord per bar, except for the penultimate bar used for a cadence. This predictable pattern allows for the high level of improvisation and variation seen in many famous works.
The origins of the folia are still a subject of historical study. It may have emerged as a dance in the mid or late fifteenth century. Scholars suggest it likely started in the Iberian Peninsula, specifically in Portugal, the Kingdom of León, or the Kingdom of Valencia. One of the earliest known examples is "Rodrigo Martínez," written by an anonymous author between 1470 and 1500. In Portugal, Renaissance theatre plays by Gil Vicente describe the folia as a dance performed by peasants or shepherds. 
Jean-Baptiste Lully played a major role in formalizing the standard melody and chord progression. He wrote an arrangement in 1670 for Louis XIV and an instrumental setting called "Air des Hautbois" in 1672. Following Lully, many legendary composers utilized the theme. Antonio Vivaldi used it in his Opus 1 No. 12 in 1705. George Frideric Handel included it in his Keyboard Suite in D minor, featuring up to forty-nine variations. Johann Sebastian Bach also used the theme in his 1742 Peasants' Cantata.
The influence of the folia extends far beyond the classical era. In the 19th century, Ludwig van Beethoven briefly quoted the theme in the second movement of his Fifth Symphony.
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