Fernando Sor was born at a time when the guitar enjoyed increasing prominence. He differed from other virtuoso-composers for the instrument such as Giuliani and Carulli due to his far greater sense of harmonic refinement. Sor's studies and exercises have been fundamental to guitarists for two centuries, and his sequence of Themes and Variations are his best-known compositions. His three collections based on popular French melodies have enjoyed popularity as has Les Folies d'Espagne avec Variations et un Menuet, but his masterpiece remains the Introduction et Variations sur un Thème de Mozart, a sublime example of his skill.