How to Build Any Chord: Triads, Seventh Chords, Extended and Altered Harmony

by

Understanding how to build chords is fundamental for musicians and composers. Chords are the building blocks of harmony, and knowing how to construct them can enhance your musical creativity. In this article, we will explore how to build various types of chords, including triads, seventh chords, and extended and altered harmony.

Triads

Triads are the simplest form of chords, consisting of three notes. They are built by stacking two thirds on top of a root note. There are four main types of triads:

  • Major Triad: Root, Major Third, Perfect Fifth
  • Minor Triad: Root, Minor Third, Perfect Fifth
  • Diminished Triad: Root, Minor Third, Diminished Fifth
  • Augmented Triad: Root, Major Third, Augmented Fifth

Building Triads

To build a triad, start with a root note. Then, determine the third and fifth based on the type of triad you want. Here’s how to construct each type:

  • Major Triad: From C, the notes are C (root), E (major third), G (perfect fifth).
  • Minor Triad: From A, the notes are A (root), C (minor third), E (perfect fifth).
  • Diminished Triad: From B, the notes are B (root), D (minor third), F (diminished fifth).
  • Augmented Triad: From E, the notes are E (root), G# (major third), B# (augmented fifth).

Seventh Chords

Seventh chords add a fourth note to the triad, creating a richer sound. There are several types of seventh chords:

  • Major Seventh: Root, Major Third, Perfect Fifth, Major Seventh
  • Minor Seventh: Root, Minor Third, Perfect Fifth, Minor Seventh
  • Dominant Seventh: Root, Major Third, Perfect Fifth, Minor Seventh
  • Diminished Seventh: Root, Minor Third, Diminished Fifth, Diminished Seventh
  • Half-Diminished Seventh: Root, Minor Third, Diminished Fifth, Minor Seventh

Building Seventh Chords

To create a seventh chord, start with a triad and add the seventh note. Here’s how to construct each type:

  • Major Seventh: From C, the notes are C (root), E (major third), G (perfect fifth), B (major seventh).
  • Minor Seventh: From A, the notes are A (root), C (minor third), E (perfect fifth), G (minor seventh).
  • Dominant Seventh: From G, the notes are G (root), B (major third), D (perfect fifth), F (minor seventh).
  • Diminished Seventh: From B, the notes are B (root), D (minor third), F (diminished fifth), A♭ (diminished seventh).
  • Half-Diminished Seventh: From D, the notes are D (root), F (minor third), A♭ (diminished fifth), C (minor seventh).

Extended Harmony

Extended harmony refers to chords that include notes beyond the seventh. These chords add complexity and richness to music. Common extended chords include:

  • Ninth Chords: Add a ninth to the seventh chord.
  • Eleventh Chords: Add an eleventh to the ninth chord.
  • Thirteenth Chords: Add a thirteenth to the eleventh chord.

Building Extended Chords

To build extended chords, start with a seventh chord and add the appropriate extensions. Here’s how to construct some common extended chords:

  • Ninth Chord: From Cmaj7, the notes are C (root), E (major third), G (perfect fifth), B (major seventh), D (ninth).
  • Eleventh Chord: From Cmaj9, the notes are C (root), E (major third), G (perfect fifth), B (major seventh), D (ninth), F (eleventh).
  • Thirteenth Chord: From Cmaj11, the notes are C (root), E (major third), G (perfect fifth), B (major seventh), D (ninth), F (eleventh), A (thirteenth).

Altered Harmony

Altered harmony involves modifying certain notes in a chord to create tension and resolution. This is often used in jazz and contemporary music. Common alterations include:

  • Flat Ninth: Lower the ninth of the chord.
  • Sharp Ninth: Raise the ninth of the chord.
  • Flat Fifth: Lower the fifth of the chord.
  • Sharp Fifth: Raise the fifth of the chord.

Building Altered Chords

To create altered chords, start with a basic chord and apply the desired alterations. Here’s how to alter a dominant seventh chord:

  • Flat Ninth Alteration: From G7, the notes become G (root), B (major third), D (perfect fifth), F (minor seventh), A♭ (flat ninth).
  • Sharp Ninth Alteration: From G7, the notes become G (root), B (major third), D (perfect fifth), F (minor seventh), A♯ (sharp ninth).
  • Flat Fifth Alteration: From G7, the notes become G (root), B (major third), D♭ (flat fifth), F (minor seventh).
  • Sharp Fifth Alteration: From G7, the notes become G (root), B (major third), D♯ (sharp fifth), F (minor seventh).

Conclusion

Building chords is essential for understanding harmony in music. By mastering triads, seventh chords, extended harmony, and altered chords, you can enhance your musical compositions and improvisations. Practice constructing these chords on your instrument, and explore how they can be used in various musical contexts.