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Encyclopedia > Perfect fourth
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The perfect fourth or diatessaron, abbreviated P4, is one of two musical intervals that span four diatonic scale degrees; the other being the augmented fourth, which is one semitone larger. The prefix perfect identifies it as belonging to the group of perfect intervals, so called because of their extremely simple pitch relationships resulting in a high degree of consonance. In music theory, an interval is the difference (a ratio or logarithmic measure) in pitch between two notes and often refers to those two notes themselves (otherwise known as a dyad). ... Jump to: navigation, search In music theory, a diatonic scale (from the Greek diatonikos, to stretch out) is a seven-note musical scale comprising five whole-tone and two half-tone steps, in which the half tones are maximally separated. ... This article is about the musical interval. ... The musical interval of a half step, semitone, or minor second is the relationship between the leading tone and the first note (the root or tonic) in a major scale. ... Pitch may refer to: Pitch is the property of a sound or musical tone measured by its perceived frequency Pitch, or tone of voice, refers to variation of tone in tonal language, and in languages with melodic accent Pitch, a throw of a baseball by a pitcher Pitch, part of... In music, a consonance (Latin consonare, sounding together) is a harmony, chord, or interval considered stable, as opposed to a dissonance, which is considered unstable. ...


Its most common occurence is between the fifth and upper root of all major and minor triads and their extensions. Jump to: navigation, search Fifth means one part out of five (1/5, 0. ... The root (basse fondamentale) of a chord is the note upon which that chord is perceived or labelled as built or centered, the root of a chord in root position or normal form. ... Generally speaking, a major chord is any chord which has a major third above its root, as opposed to a minor chord which has a minor third. ... Generally speaking, a minor chord is any chord which has a minor third above its root, as opposed to a major chord which has a major third. ... Extended chords are tertian chords (built from thirds) or triads with notes extended, or added, beyond the seventh, including all the thirds in between the seventh and the extended note. ...


A perfect fourth in just intonation corresponds to a pitch ratio of 3:4, while in an equal tempered tuning, a perfect fourth is equal to five semitones, a ratio of 1:25/12 (approximately 1:1.3348), or 500 cents, about 1.955 cents wide. Just intonation is any musical tuning in which the frequencies of notes are related by whole number ratios. ... Equal temperament is a scheme of musical tuning in which the octave is divided into a series of equal steps (equal frequency ratios). ... The cent is a unit in a logarithmic scale of relative pitch or intervals. ...


The perfect fourth, although a perfect interval like the unison, octave, and perfect fifth, is actually considered a dissonance in certain contexts. Specifically, it is considered consonant when heard in its most common position as detailed above; but dissonant when built upon a chord's root. In such a position, it almost always temporarily displaces the third of any chord, and is then called a suspended fourth. UNISON logo UNISON is the largest trade union in the United Kingdom, with over 1. ... In music, an octave (sometimes abbreviated 8ve or 8va) is the interval between one musical note and another with half or double the frequency. ... The musical interval of a perfect fifth is the relationship between the first note (the root or tonic) and the fifth note in a major scale. ... In music, see the following intervals: Major third Minor third The mediant, and the chord built on the mediant, is often called simply the third, as it is the third degree of the diatonic scale. ...


Conventionally, the strings of a double bass and a bass guitar are tuned by intervals of perfect fourths, while all strings but one of a guitar are tuned to intervals of perfect fourths. Side and front views of a modern double bass with a French bow. ... Jump to: navigation, search A bass guitar is an electric or acoustic bass - a stringed instrument similar in design to the guitar, but with longer scale and tuned lower in pitch. ...


See also

Perfect fourth
# semitones Interval class # cents in equal temperament Most common diatonic name Comparable just interval # cents in just interval Just interval vs. equal-tempered interval
5 5 500 perfect fourth 4:3 498 2 cents smaller
Other diatonic intervals
unison | minor second | major second | minor third | major third | perfect fourth | tritone | perfect fifth | minor sixth | major sixth | minor seventh | major seventh | octave

The augmented fourth between C and F# forms a tritone. ... The musical interval of a half step, semitone, or minor second is the relationship between the leading tone and the first note (the root or tonic) in a major scale. ... In music, specifically, musical set theory an interval class, or unordered pitch-class interval, is an interval measured by the distance between its two pitch classes ordered so they are as close as possible. ... The cent is a unit in a logarithmic scale of relative pitch or intervals. ... Equal temperament is a scheme of musical tuning in which the octave is divided into a series of equal steps (equal frequency ratios). ... In Music theory, the diatonic major scale (also known as the Guido scale), from the Greek diatonikos or to stretch out, is a fundamental building block of the European-influenced musical tradition. ... Just intonation is any musical tuning in which the frequencies of notes are related by whole number ratios. ... In music theory, an interval is the distance in pitch between two notes, the lower and higher members of the interval. ... UNISON logo UNISON is the largest trade union in the United Kingdom, with over 1. ... Jump to: navigation, search A minor second is the smallest of three commonly occuring musical intervals that span two diatonic scale degrees; the others being the major second and the augmented second, which are larger by one and two semitones respectively. ... Jump to: navigation, search A major second is one of three commonly occuring musical intervals that span two diatonic scale degrees; the others being the minor second, which is one semitone smaller, and the augmented second, which is one semitone larger. ... Jump to: navigation, search A minor third is the smaller of two commonly occuring musical intervals that span three diatonic scale degrees. ... Jump to: navigation, search A major third is the larger of two commonly occuring musical intervals that span three diatonic scale degrees. ... The augmented fourth between C and F# forms a tritone. ... The musical interval of a perfect fifth is the relationship between the first note (the root or tonic) and the fifth note in a major scale. ... The musical interval of a minor sixth is the relationship between the first note (the root or tonic) and the sixth note in a minor scale. ... The musical interval of a major sixth is the relationship between the first note (the root or tonic) and the sixth note in a Major scale. ... The musical interval of a minor seventh the first note (the root or tonic) and the seventh in a minor scale. ... The musical interval of a Major seventh the first note (the root or tonic) and the seventh, the leading tone, in a major scale. ... In music, an octave (sometimes abbreviated 8ve or 8va) is the interval between one musical note and another with half or double the frequency. ...

External links


  Results from FactBites:
 
Dolmetsch Online - Music Theory Online - Notes, Harmonies & Scales (7307 words)
Pythagoras may also have discovered that the interval of a perfect fifth was associated with the ratio 3:2, and that the octave could be completed with a second complementary interval, a perfect fourth, associated with the ratio 4:3.
Using the fact that a perfect fourth is made up of two tones plus one semitone, the ratio for the semitone was calculated to be 256:243.
G Lydian, for example, is constructed on the fourth degree of the scale of D major, i.e.
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