During the Renaissance period from 1420-1600, vocal polyphony developed in several ways. Franco-Flemish composers like Ockeghem, Busnoys, Obrecht, Isaac, and Des Prez advanced the genre through more complex meter, cadences using triads rather than double leading tones, and greater use of imitation between equal voices. They also composed secular masses and chansons in addition to sacred masses and motets. By the late Renaissance, composers like Des Prez expertly set text to music and incorporated both imitation and homophony into highly structured works.