 This mass is based on a secular—indeed ribald—tune similar to "Three Blind Mice".That basing a mass on such a source was an accepted procedure is evident from the existence of the mass in Sistine Chapel part-books copied during the papacy of Julius II (1503 to 1513).Josquin's most famous cantus-firmus masses are the two based on the L'homme armé tune, which was the favorite tune for mass composition of the entire Renaissance.