Fundamentals of
SCALES AND KEY SIGNATURES

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PART A--TETRACHORDS

1. Tetrachord Structure

a. A tetrachord is a series of four tones on successive degrees of the staff with an interval of five half steps between the first and last tones. The tetrachord is used in constructing and analyzing scales.

b. Tetrachords used are the major (M), minor (m), natural (N), and harmonic (H). Any tetrachord may be constructed on any pitch and will retain the interval relationship of the tetrachord.


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Last Updated: March 31, 2012