Answer:Classically, the diatonic tetrachord consists of two intervals of a tone and one of a semitone, e.g. A–G–F–E.
Explanation:
Tetrachord will have ONLY four notes and they will all be BETWEEN a Root and the 4th.
What does this mean to you? You will soon find out, but it's meant A LOT to A LOT of people over the years.
The fundamental concepts are two different types of Tetrachords, the Major Tetrachord and the Minor Tetrachord.
The Major Tetrachord:
Interval Names = R 2 M3 4
Interval spacing = W W H
C Major Tetrachord = C D E F
The Minor Tetrachord:
Interval Names = R 2 b3 4
Interval Spacing = W H W
C Minor Tetrachord = C D Eb F
The note names themselves are not so important as much as the idea and the Interval awareness, that you will soon realize.
The Major and Minor Tetrachords are the two fundamental Tetrachords. And, the ONLY difference is that the 3rd is a M3 in the Major Tetra and the 3rd is a b3, or m3, in the Minor Tetra. Other wise they each have the same R, 2, and 4.
