Fourth (music)

For the Soft Machine album, see Fourth (album). For other uses, see Fourth.

In music, a fourth is an interval spanning four staff positions in the musical notation common in Western culture.

Specific fourth intervals include:

* Perfect fourth, the fourth spanning five semitones
* Diminished fourth, a perfect fourth narrowed by a chromatic semitone, thus spanning four semitones
* Augmented fourth or tritone, an interval of three adjacent whole tones (six semitones)

In addition, fourth in music may refer to:

* Quartal harmony, harmonic structures built from the perfect fourth, the augmented fourth and the diminished fourth
* Subdominant, the fourth tonal degree of the diatonic scale

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