(1) One of the three fixed forms, together with the ballade and the virelai, that dominated French song and poetry in the 14th and 15th centuries. It had taken on its definitive structure by the early 13th century, when it was already a dance-song of importance. Its derivation from the Latin forms rotundettum or rotundellum implies circular motion in the dances for which such pieces were originally sung. The earliest dated rondeau is in a collection of courtly and popular songs of 1228, the essential features being the presence of a final refrain and the anticipation of the first part of this refrain in line two. Later the refrain was also introduced at the beginning of the poem, giving the form which was to remain the basis of the rondeau: I-II-I-I-I-II-I-II. This eight-line type is the most common in the late 13th and 14th centuries. Adam de la Halle's 14 three-voice settings in conductus style are the first polyphonic examples. It is distinguished from the virelai in that the rondeau refrain requires the whole melody, not simply part of it. This may explain why these refrains enjoyed an independent life and were inserted into other songs and motets. The rhyme and metre may vary, particularly in the early period; from Machaut onwards the eight- and 16-line type dominates, the 21-line type becoming popular in the 15th century when it outshone the other lyric forms. Like the virelai and ballade, the rondeau is generally concerned with courtly love, usually in a rather lighter vein. It was also used in religious drama.
(2) French term of the Baroque period for a composition based on the alternation of a main section (refrain, reprise, grand couplet or ‘rondeau’), with subsidiary sections (couplets, episodes); see Rondo. Rondeaux are common in harpsichord music, for example Couperin s; they also appear in dance music, as in Rameau's opera Hippolyte et Aricie where there is a ‘Menuet en rondeau’. In England the corruption ‘Round O’ was common.