What is the Catalan 'Virolai' in English?

"A poem to be set to music" is an English equivalent of the Catalan word "Virolai."

Specifically, the word refers to an ancient literary form within Catalan culture. One of its most prominent and enduring examples is "El Virolai de Montserrat." This is a chant in honor of Our Lady (Mary, mother of Jesus) of Montserrat. It often is referred to as "Rosa d'abril" ("Rose of April), which are the first words in the text.