Mediaeval song has gone through the same change of perspective as folk ballads since Child - people are finding more and more ways they fit to music. It took decades after its first publication for anyone to try to sing the Carmina Burana to the intended tunes. (With short and standard forms like the rondel, there was no need for Chaucer to specify a tune since there were lots to choose from, like the "common" psalm tunes of the Reformation).