Pérotin was a French composer active in the late 12th to early 13th century who was a member of the Notre Dame school of polyphony. He was called "Pérotin the Great" and is known for composing organum, where he added voices above and below Gregorian chant to create harmonies of perfect fourths and fifths. Pérotin began writing organum with three and four voices, using rhythmic modes for the upper voices and techniques like voice exchange. One of his most famous works is Viderunt omnes, composed in 1198.

1. Pérotin

2. Pérotin
• Late 12th- Early 13th Century
• Called “Pérotin the Great”
• He is French and member of Notre Dame
school of polyphony
• Composed organum, which added voices
above and below chant to create perfect 4ths
and 5ths

3. Organum
• Upper voices use rhythmic modes
• Duplum- two voices
• Triplum- three voices
• Quadruplum- four voices
• Pérotin began first writings in triplum and
quadruplum
• Voice Exchange was used

4. Greatest Hits
• Viderunt omnes (Composed in 1198)