A chaconne ; Italian: ciaccona 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.
Read more about Chaconne: History, Chaconne and Passacaglia