A virelay or a triolet.
"Patty's Success" by Carolyn Wells
He took much delight in minstrelsy, and at his midnight supper songs and virelays were chanted to him.
"The Red True Story Book" by Various
In the lines which have been quoted he speaks of the "ballades, roundels, and virelayes" which he had composed.
"Library of the World's Best Literature, Ancient and Modern, Vol. 9" by Various