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Saturday, May 28, 2011
Tetrachord Theory Trivia
A TETRACHORD is a group of 4 notes spanning the interval of a 4th. Two Tetrachords stacked make a scale. It turns out that 4 important scales in Jazz consist of the SAME tetrachord played twice- first starting from the Root, and the second tetrachord starting from the 5th. None of the other Jazz Modes and commonly played scales have this feature. They are : MAJOR, DORIAN, PHRYGIAN, and ARABIC MINOR. Notice that the pattern of half-steps and whole-steps are the repeated for the upper half of each scale.
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