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Chords by perfect fourth are ambiguous in that, like all chords built by equidistant intervals (diminished seventh chords or augmented triads), any member can function as the root. The indifference of this rootless harmony to tonality places the burden of key verification upon the voice with the most active melodic line.
Cmaj11: C-F-C-G-B-E (used by Soundgarden on the song "4th of July") Cm add4: C-F-C-G-C-D# (used by This Town Needs Guns on "Baboon" and "Lemur") Open Page/Csus2/Gsus4: D-G-C-G-C-D (used by Jimmy Page in "The Rain Song") Dm7: D-A-D-F-A-C (used by Richie Havens in "From the Prison") [24] Dm9: D-A-D-F-C-E; Dm add9: D-A-D-F-A-E (used by Opeth on ...
That same E might be harmonized with a C major chord (C – E – G), making it the third of the chord. This concept extends to ninths (E would act as the 9th if harmonized with a Dm7 chord – D – F – A – C – E), ♯ fifths (E would act as ♯ 5 on an A ♭ augmented chord – A ♭ – C – E), and a wide array of other options.
When used with chord symbols, the Roman numerals represent the root of a triad built on the associated scale step. In music theory based on the practices of the common practice period and its derivations the chord numerals are often written in upper case for chords in the major family, and in lower case for chords in the minor family, with the usual "m" or "—" minor chord quality suffix ...
For example, the ascending interval from C to the next F is a perfect fourth, because the note F is the fifth semitone above C, and there are four staff positions between C and F. Diminished and augmented fourths span the same number of staff positions, but consist of a different number of semitones (four and six, respectively).
Therefore, a seven-note diatonic scale allows seven basic diatonic triads, each degree of the scale becoming the root of its own chord. [1] A chord built upon the note E is an E chord of some type (major, minor, diminished, etc.) Chords in a progression may also have more than three notes, such as in the case of a seventh chord (V 7 is ...
The suspended fourth chord is often played inadvertently, or as an adornment, by barring an additional string from a power chord shape (e.g., E5 chord, playing the second fret of the G string with the same finger barring strings A and D); making it an easy and common extension in the context of power chords.
The augmented-fourth interval is the only interval whose inverse is the same as itself. The augmented-fourths tuning is the only tuning (other than the 'trivial' tuning C-C-C-C-C-C) for which all chords-forms remain unchanged when the strings are reversed. Thus the augmented-fourths tuning is its own 'lefty' tuning." [2]