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Tetrachord

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tetrachord [′te·trə‚kȯrd]
(acoustics)
The basis of a variety of ancient musical scales, consisting of four notes, with an interval of a perfect fourth between the highest and lowest notes.

Tetrachord 

in music, a succession of four pitches contained within the limits of a fourth. Tetrachords were the basis of musical modes and of the entire scale in ancient Greek music. The Greek names for diatonic tetrachords, just as the names for the corresponding modes, are still used in modern music theory, but they refer to modes with different interval structures.



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New material includes Major tetrachords, Major scales and keys for C, G and D.
This can be replaced by DISJUNCT TETRACHORD, an uncapitalized term from Webster's Third.
Tomlinson, after Foucault, draws a line between resemblance and representation as separate categories: the one betokens an affinity between the madrigalism and the word prompting it; the other, a musical idea that is autonomous, albeit indicative of a certain emotion or thought or state, as, say, a descending tetrachord that, by a consensual decision reached by composers, was widely utilized as an emblem of lament.
 
 
 
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