"La Follia" is a musical theme that originated in the late 16th century, characterized by its lively tempo and repetitive structure. It has been used by various composers throughout history, making it a popular basis for variations and improvisations. The theme often evokes a sense of madness or folly, which is reflected in its name. Many notable composers, including Antonio Vivaldi and Arcangelo Corelli, have created variations on "La Follia." The piece typically features a series of variations that build in complexity, showcasing the performers' technical skills. Its enduring popularity highlights its influence on classical music and its adaptability across different styles.