A ballad /ˈbæləd/ is a form of verse, often a narrative set to music. Ballads derive from the medieval French chanson balladée or ballade, which were originally "dancing songs". Ballads were particularly characteristic of the popular poetry and song of the British Isles from the later medieval period until the 19th century and used extensively across Europe and later the Americas, Australia and North Africa. Many ballads were written and sold as single sheet broadsides. The form was often used by poets and composers from the 18th century onwards to produce lyrical ballads. In the later 19th century the term took on the meaning of a slow form of popular love song and is now often used for any love song, particularly the pop or rock power ballad.