This is either an English piece or a Continental one to which a fourth part has been added to produce a characteristically English triadic sonority. The text flows from the Triplum to the Duplum and therefore a sequential performance would have been possible, but we have opted for a simultaneous one with the lower two parts vocalized. Note the major triad which ends the piece, unthinkable in French music of the thirteenth century.
from notes by Christopher Page ©