Tetrachords | Circle of Fifths | Part 1

Major Tetrachords · Major Scales

 

A major tetrachord is a series of four notes with the interval pattern tone – tone – semitone (2-2-b2).

major-tetrachords

 

A major scale is a combination of two major tetrachords separated by a major second (2).

major-scale

 

Cmaj Scale

major-scale-two-major-tetrachords

The Cmaj scale is a combination of the Cmaj tetrachord and the Gmaj tetrachord separated by a whole-tone.

 

Gmaj Scale

The upper tetrachord G A B C of the Cmaj scale becomes the lower tetrachord of the Gmaj scale.

major-scale-two-major-tetrachords-gmaj-scale

The Gmaj scale is a combination of the Gmaj tetrachord and the Dmaj tetrachord separated by a whole-tone.

 

Dmaj Scale

The upper tetrachord D E F# G of the Gmaj scale becomes the lower tetrachord of the Dmaj scale.

D-major-scale-two-major-tetrachords

 

The Dmaj scale is a combination of the Dmaj tetrachord and the Amaj tetrachord separated by a whole-tone.

 

And so on…continuing this series of tetrachords will result in the circle of fifths.

 

Series of Major Tetrachords → Circle of Fifths

 

major-tetrachords-circle-of-fifths

 

See part 2 of this tutorial here

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