Round 6: Tossup 17

Much of Salomone (“sa-lo-mo-nay”) Rossi’s music has been recorded by an ensemble called the “prophets” of this interval, which was founded by Youtuber Elam Rotem. An octave and this interval are held on most changes of syllable in Perotin’s Viderunt Omnes. The scale degree above ut that forms this interval is the first note in the hard hexachord. This interval and its smaller inversion were used to harmonize cantus firmi in (*) organum. This interval separates the Ionian mode from the Mixolydian mode above it. Pythagorean tuning (10[1])constructs all intervals from this interval’s frequency ratio of three to two. Like the octave and unison, contrapuntal independence is broken by using this interval in parallel. (10[1])For 10 points, a circular diagram organizes keys by what interval that separates A from the next highest E? ■END■

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