Diatonic triads
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Diatonic Triads. Kostka /Payne – Chapter 4. Introduction. Most chords in tonal music are made up only of notes from the scale on which the passage is based. That is, if a passage is in G major, most of the chords contain only notes found in the G major scale.

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Diatonic Triads

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Diatonic triads

Diatonic Triads

Kostka/Payne – Chapter 4


Introduction

Introduction

  • Most chords in tonal music are made up only of notes from the scale on which the passage is based. That is, if a passage is in G major, most of the chords contain only notes found in the G major scale.

  • These are called DIATONIC CHORDS.


Diatonic triads in major

Diatonic Triads in Major

We start with a Major Scale …


Diatonic triads in major1

Diatonic Triads in Major

Then we create triads using only the notes of the scale.


Diatonic triads

Next we analyze the Qualities. . .


Roman numerals

Roman Numerals

  • To distinguish the triads built on the various scale degrees from the scale degrees themselves, we use roman numerals instead of arabic numerals. (for example, V instead of 5).

  • The triad type is indicated by the form of the roman numeral itself. (Uppercase or Lowercase)


Roman numerals1

Roman Numerals


Roman numerals2

Roman Numerals


Roman numerals3

Roman Numerals


Roman numerals4

Roman Numerals


Roman numerals5

Roman Numerals


Roman numerals6

Roman Numerals


Roman numerals7

Roman Numerals


Roman numerals8

Roman Numerals


Roman numerals9

Roman Numerals


Roman numerals10

Roman Numerals

You MUST memorize these.


Minor triads

Minor Triads

  • Remember that we have three forms of the minor scale.

  • This creates multiple possibilities for diatonic triads in minor.

  • This is a result of or 6 and 7 scale degrees.


Minor triads1

Minor Triads

  • Notice that the roots of the circled triads above all belong to the harmonic minor scale.

  • In fact, all notes of the circled triads belong to the harmonic minor scale. (except the 5th of the III chord.)


Minor triads2

Minor Triads

You MUST memorize the circled chords.


Diatonic seventh chords in major

Diatonic Seventh Chords in Major

  • The chords on each scale degree in major can include a 7th above the root.

  • The roman numeral system for seventh chords is similar to that of triads.


Seveventh chords in major

Seveventh Chords in Major

You MUST memorize these.


Seventh chords in minor

Seventh Chords in Minor

You MUST memorize these too.


Summary

Summary

Triads

T

Major IiiiiiIVVvivii°

Minor iii°IIIivVVIvii°

Seventh Chords

Major IM7ii7iii7IVM7V7vi7vii°7

Minor i7ii°7IIIM7iv7V7VIM7vii°7

You MUST memorize the chart above.


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