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The only composers whose names have come down to us from this time are Leonin and Perotin. Both were mentioned by an anonymous English student, known as Anonymous IV, who was either working or studying at Notre Dame later in the 13th century. In addition to naming the two composers as "the best composers of organum," and specifying that they compiled the big book of organum known as the Magnus Liber , he provides a few tantalizing bits of information on the music and the principles involved in its composition. Perotin is the first composer of organum quadruplum--four-voice polyphony--at least the first composer whose music has survived, since complete survivals of notated music from this time are spotty at best.

Leonin, Perotin and the other anonymous composers whose music has survived are representatives of the era of European music history known as the ars antiqua. The motet was first developed during this period out of the clausula, which is one of the most frequently encountered types of composition in the Magnus Liber.

While music with notation has survived, in substantial quantity, the interpretation of this music, especially with regard to rhythm, remains controversial. Three music theorists describe the contemporary practice: Johannes de Garlandia , Franco of Cologne , and Anonymous IV; however they were all writing more than two generations after the music was written, and may have been imposing their current practice, which was quickly evolving, on music which was conceived differently. In much music of the Notre Dame School the lowest voices sings long note values while the upper voice or voices sing highly ornamented lines, which often use repeating patterns of long and short notes known as the " rhythmic modes ."

Contemporary composers such as Steve Reich and Arvo PärtArvo Part (born 1935) is an Estonian composer, often identified with the school of minimalism. Although at the time of Part's birth Estonia was a nascent independent republic, the Soviet Union took control of it in 1940, and stayed except for a brief peri claim to have been influenced by the music of the Notre Dame School.

Sources and Further Reading

• Richard H. Hoppin, Medieval Music. New York, W.W. Norton & Co., 1978. (BooksEnthsiast.com)
• Harold Gleason and Warren Becker, Music in the Middle Ages and Renaissance (Music Literature Outlines Series I). Bloomington, Indiana. Frangipani Press, 1986. (BooksEnthsiast.com)
• Articles "Notre Dame School," " Organum," " Leonin," " Perotin," The New Grove Dictionary of Music and Musicians, ed. Stanley Sadie. 20 vol. London, Macmillan Publishers Ltd., 1980. (BooksEnthsiast.com)