Passacaglia is a musical form that consists of variations of a repeating bassline. Synonyms for passacaglia include chaconne, ground bass, and basso ostinato. The chaconne was a popular form in Baroque music that also featured a repeating bassline. Ground bass refers to the same concept but has its origins in Medieval music. Basso ostinato is Italian for "persistent bass" and has been employed in music from the Renaissance to contemporary times. All of these terms refer to the use of a repetitive bassline in music and create a foundation for a composer to build upon with variations and embellishments.