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 corresponding to this interval begins modes named for the prefix “hypo-” (-5[1])as well as the hard hexachord. Either this interval or its smaller inversion was used in (*) organum to harmonize plainchants. This interval separates the tonics of the Ionian and Mixolydian (10[1])modes. (10[1]-5[1])Pythagorean tuning constructs all intervals from this interval’s frequency ratio of three to two. (10[1])Like the octave and unison, contrapuntal independence is broken by using (10[1])this interval in parallel. For 10 points, a circular diagram organizes keys by what interval that separates A from the next highest E? ■END■ (10[1])

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