A chaconne (/ʃəˈkɒn/; French: [ʃakɔn]; Spanish: chacona; Italian: ciaccona, pronounced [tʃakˈkoːna]; earlier English: chacony) is a type of musical composition popular in the baroque era when it was much used as a vehicle for variation on a repeated short harmonic progression, often involving a fairly short repetitive bass-line (ground bass) which offered a compositional outline for variation, decoration, figuration and melodic invention. In this it closely resembles the passacaglia.
The ground bass, if there is one, may typically descend stepwise from the tonic to the dominant pitch of the scale; the harmonies given to the upper parts may emphasize the circle of fifths or a derivative pattern thereof.
Though it originally emerged during the late sixteenth century in Spanish culture, having reputedly been introduced from the New World, as a quick dance-song characterized by suggestive movements and mocking texts, by the early eighteenth century the chaconne had evolved into a slow triple meter instrumental form.
Alex Ross describes the origins of the chacona as actually having been a sexily swirling dance that appeared in South America at the end of the sixteenth century and quickly spread to Europe. The dance became popular both in the elite courts and in the general population. "Un sarao de la chacona" is one of the earliest known examples of a "chacona", written down by Spanish musician Juan Arañés.