Tetrad

Not to be confused with Tetrachord.

A tetrad is a chord of four pitch classes. Some examples are major seventh, minor seventh, dominant seventh, diminished seventh, and augmented seventh chords. Some microtonal ones include harmonic seventh and neutral seventh chords.

English Wikipedia has an article on:

Tetrad (music)

There are lots of seventh chords, but tetrads can also be add chords, like major add 2, or major add 6.

See also

• Chords by size:
  • Monad
  • Dyad
  • Triad
  • Pentad
  • Hexad

External links

• Tonalsoft Encyclopedia | Tetrad

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