
1) French poetry
Found on
https://www.crosswordclues.com/clue/virelai

A virelai is a form of medieval French verse used often in poetry and music. It is one of the three formes fixes (the others were the ballade and the rondeau) and was one of the most common verse forms set to music in Europe from the late thirteenth to the fifteenth centuries. One of the most famous composers of virelai is Guillaume de Machaut (c....
Found on
http://en.wikipedia.org/wiki/Virelai

one of several formes fixes (`fixed forms`) in French lyric poetry and song of the 14th and 15th centuries (compare ballade; rondeau). It probably ... [4 related articles]
Found on
http://www.britannica.com/eb/a-z/v/27

Complex 14th Century French form composed of long and short lines. The long lines of the second stanza take their rhyme from the short lines of the first stanza. This pattern continues through out the poem until the final stanza - where the short lines take their rhyme from the long lines of the first stanza.
Found on
http://www.poetsgraves.co.uk/glossary_of_poetic_terms.htm

one of the French formes fixe , cultivated in the thirteenth, fourteenth and fifteenth centuries. A strophic piece with an internal structure of A b b a A , where a capital letter designates a repetition of both text and music and lower case designates new text. The virelai typically had three stanzas; its refrain could easily lead into the new tex...
Found on
https://www.arlima.net/the-orb/encyclop/culture/music/orbgloss.htm
No exact match found.