The passacaglia is a musical form that originated in early seventeenth-century Spain and is still used today by composers. It is usually of a serious character and is typically based on a bass-ostinato and written in triple metre.

In music, an ostinato is a motif or phrase that persistently repeats in the same musical voice, frequently in the same pitch. Well-known ostinato-based pieces include classical compositions such as Ravel's Boléro and the Carol of the Bells, and popular songs such as Donna Summer and Giorgio Moroder's "I Feel Love" (1977), Henry Mancini's theme from Peter Gunn (1959), The Who's "Baba O'Riley" (1971), The Verve's "Bitter Sweet Symphony" (1997), and Flo Rida's "Low" (2007).