 As in the cantus-firmus technique, the source tune may appear in many voices of the mass.Several of Josquin's masses feature the paraphrase technique, and they include some of his most famous work including the great "Missa Gaudeamus".The relatively early "Missa Ave maris stella", which probably dates from his years in the Sistine Chapel choir, paraphrases the Marian antiphon of the same name; it is also one of his shortest masses.