Organum

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The organum, which thrived at Notre Dame cathedral in Paris, was one of the earliest types of polyphony. It was very much similar to a trope, as it added vertical notes onto an existing melody or plainchant. There is quite the development of the organum between the 10th and 12th centuries. French composers, Leoninus, and Perotinus, were leading contributors to the evolution of the organum advancing the terms “free organum”, and “discant organum”. Through examining the works throughout Musica enchiriadis of the 10th century, and the compositions of Leoninus and Perotinusis in the 12th century, it is made clear that the the organum endured influential alterations both melodically and rhythmically.

The 10th century organum features a duplicated fourth, fifth, or octave below the plainchant melody in the principal voice. The duplicated voice moves in oblique and/or contrary motion, with a multitude of intervals interspersed. In addition to oblique and contrary motion, there is parallel motion, and similar motion. All of these types of motion can be featured in an organum, however in the 10th century, oblique and contrary were the most typical. An example of a 10th century organum can be found in Musica enchiriadis. Musica enchiriadis is an anonymous treatise that was the first of its kind to describe polyphony. It set up a system of guidelines for polyphony, and it included many examples of the organum. While the examples in Musica enchiriadis are mere teachings and instructions on how to sing an organum, some of the earliest examples of organums ever recorded exist within the treatise.

As the 12th century approached, the organum withstood many modifications in terms of rhythm and melody. Additionally, the terms “free or...

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...uadruplum”, for four voices. While more voices were added, there was still a constant drone that maintained the chant melody below. These changes in organum are featured in Perotinus’s Viderunt omnes. In addition to the added voices, there are rhythmic modes in the upper voices that repeat phrases.

Through using Musica enchiriadis as an example of the 10th century, and the works of Leoninus and Perotinusis as examples in the 11th and 12th century, it is evident that the organum experienced a copious amount of changes between the 10th and 12th century both melodically and rhythmically including the adding of voices, the changing of motion, and the development of rhythm. These adaptations to the organum, though might seem insignificant, tremendously helped further the evolution of polyphony in western music, which consequently contributes to the music of today.

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