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A refrain (from the Old French refraindre "to repeat," likely from Vulgar Latin refringere) is the line or lines that are repeated in music or in verse; the "chorus" of a song.
Poetic fixed forms that feature refrains include the villanelle, the virelay, and the sestina. However, the use of refrains is particularly associated with popular music, especially rock and roll, where the verse-chorus-verse song structure typically places a refrain in almost every song. See: strophic form.
In music, a refrain has two parts: the lyrics of the song, and the melody. Sometimes refrains vary their words slightly when repeated; recognisability is given to the refrain by the fact that it is always sung to the same tune, and the rhymes, if present, are preserved despite the variations of the words. Such a refrain is featured in "The Star-Spangled Banner," which contains a refrain which is introduced by a different phrase in each verse, but which always ends:
A similar refrain is found in the "Battle Hymn of the Republic," which affirms in successive verses that "Our God," or "His Truth." is "marching on."
Refrains usually, but do not always, come at the end of the verse. Some songs, especially ballads, incorporate refrains into each verse. For example, the traditional ballad The Cruel Sister includes a refrain mid-verse:
Here, the refrain is syntactically independent of the narrative poem in the song, and has no obvious relationship to its subject. The device has sometimes been used, however, to add material which does in fact relate to the subject of the poem. Such a refrain is found in Dante Gabriel Rossetti's Troy Town:
Phrases of apparent nonsense in refrains (Lay the bent to the bonny broom?), and solfege syllables such as fa la la, familiar from the Christmas carol Deck the Halls with Boughs of Holly, have given rise to much speculation. Some believe that the traditional refrain Hob a derry down O encountered in some English folksongs is in fact an ancient Celtic phrase meaning "dance around the oak tree." These suggestions remain controversial.