Short answers, pulled from the story.
Jean Mouton (c. 1459-1522) was a French composer and court musician renowned for his motets, which are among the most refined of the Renaissance period. He is historically significant both for his own music and for being the teacher of Adrian Willaert, one of the founders of the Venetian School.
Jean Mouton taught Adrian Willaert, who became one of the founders of the Venetian School. Through Willaert, Mouton's influence extended to Gioseffo Zarlino, the prominent music theorist who referred to Mouton as his "precettore," meaning teacher.
Mouton served as the principal composer for the French court and wrote music for state occasions including weddings, coronations, papal elections, births, and deaths. He composed Christus vincit for the election of Pope Leo X in 1513 and Non nobis Domine for the birth of Princess Renee on the 25th of October 1510.
9 Magnificat settings, 15 masses, 20 chansons, and over 100 motets by Jean Mouton survive. The survival rate is relatively high for a Renaissance composer because his status as a court composer meant his music was widely distributed, copied, and archived. The publisher Ottaviano Petrucci printed an entire volume of his masses.
Mouton used paired imitation, canonic techniques, and equal-voiced polyphonic writing, producing a rhythmically and texturally uniform sound in which all voices sing together. The theorist Heinrich Glarean described his melodic style as flowing "in a supple thread." Around 1500, his music showed a growing awareness of harmonic and chordal feeling, likely influenced by Italian music.
The Medici Codex is an illuminated manuscript regarded as one of the primary manuscript sources of Renaissance music, presented as a wedding gift for Lorenzo de' Medici. Jean Mouton is considered a possible editor of the codex.