Ballad, derived from the late Latin verb ballare (to dance), came to be used primarily to describe a folksong of narrative character or a song or poem written in imitation of such a folksong. The title Ballade was used by Chopin to describe four piano pieces of otherwise concealed narrative content, apparently based on narrative poems of ballad type by the patriotic poet Mickiewicz, while Brahms in one of his ballades transfers into music an old Scottish narrative ballad. The ballade of French music and poetry of the 14th and 15th centuries denotes a different and fixed literary and musical form.