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In music theory, a tetrachord (Greek: τετράχορδoν; Latin: tetrachordum) is a series of four notes separated by three intervals.In traditional music theory, a tetrachord always spanned the interval of a perfect fourth, a 4:3 frequency proportion (approx. 498 cents)—but in modern use it means any four-note segment of a scale or tone row, not necessarily related to a particular tuning ...
The elaboration of tetrachords was also accompanied by penta- and hexachords. The joining of a tetrachord and a pentachord yields an octachord, i.e. the complete seven-tone scale plus a higher octave of the base note. However, this was also produced by joining two tetrachords, which were linked by means of an intermediary or shared note.
In contrast, the ancient Greek chromatic scale had seven pitches (i.e. heptatonic) to the octave (assuming alternating conjunct and disjunct tetrachords), and had incomposite minor thirds as well as semitones and whole tones. The (Dorian) scale generated from the chromatic genus is composed of two chromatic tetrachords:
Hastings made the story up to summarize Netflix's value proposition; Netflix's founders were actually inspired by Amazon. [10] PepsiCo in no real sense ever owned the "6th most powerful navy" in the world after a deal with the Soviet Union. In 1989, Pepsi acquired several decommissioned warships as part of a barter deal.
A remarkable fact about tetrachords was noticed since the Ancient times and rediscovered in early Renaissance: when a tetrachord features a semitone (half-step) between two of its tones, it is the semitone that will determine the melodic tendency of the given tetrachord or mode (when combining tetrachords). [11]
Pyknon (from Greek: πυκνόν), sometimes also transliterated as pycnon (from Greek: πυκνός close, close-packed, crowded, condensed; Latin: spissus) in the music theory of Antiquity is a structural property of any tetrachord in which a composite of two smaller intervals is less than the remaining (incomposite) interval.
Scientists have linked molecules into bizarre special states that make them interact simultaneously with each other even if they are miles apart, a breakthrough that could propel quantum computing
There are some fragments of actual Greek musical notation, [1] [2] many literary references, depictions on ceramics and relevant archaeological remains, such that some things can be known—or reasonably surmised—about what the music sounded like, the general role of music in society, the economics of music, the importance of a professional ...