 Inside of his chansons, he often used a cantus firmus, sometimes a popular song whose origin can no longer be traced, as in "Si j'avoye Marion".Other times he used a tune originally associated with a separate text; and still other times he freely composed an entire song, using no apparent external source material.Another technique he sometimes used was to take a popular song and write it as a canon with itself, in two inner voices, and write new melodic material above and around it, to a new text