Backdoor progression and Secondary chord

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Difference between Backdoor progression and Secondary chord

Backdoor progression vs. Secondary chord

In jazz and jazz harmony, the chord progression from iv7 to bVII7 to I (the tonic or "home" key) has been nicknamed the backdoor progressionCoker, Jerry (1997). A secondary chord is an analytical label for a specific harmonic device that is prevalent in the tonal idiom of Western music beginning in the common practice period, the use of diatonic functions for tonicization. In the tonal idiom, a song or piece of music has a tonic note and chord, which is based on the root of the key that the piece is in. The most important chords in a tonal song or piece are the tonic chord (labeled as I in harmonic analysis) and the dominant chord (V). A piece or song is said to be in the key of the tonic. In the key of C major, the tonic chord is C major and the dominant chord is G. Chords are named after the function they serve and their position (for example, the "dominant" is considered the most important after the tonic and the "subdominant" is the same distance from the tonic as the dominant but below rather than above) and numbered by the scale step of the chord's base note (the root of the vi chord is the sixth scale step). Secondary chords are altered or borrowed chords, chords which are not in the key. Secondary chords are referred to as the function they are serving of the key or chord to which they function and written "function/key". Thus, the dominant of the dominant is written "V/V" and read as, "five of five," or, "dominant of the dominant". Any scale degree with a major or minor chord on it may have any secondary function applied to it; secondary functions may be applied to diminished triads in some special circumstances. Secondary chords were not used until the Baroque period and are found more frequently and freely in the Classical period, even more so in the Romantic period, and, although they began to be used less frequently with the breakdown of conventional harmony in modern classical music, secondary dominants are a "cornerstone," of popular music and jazz of the 20th century.Benward & Saker (2003), p.273-7.

Borrowed chord

A borrowed chord (also called mode mixture,Romeo, Sheila (1999). Complete Rock Keyboard Method: Mastering Rock Keyboard, p.42.. Bouchard, Joe and Romeo, Sheila (2007). The Total Rock Keyboardist, p.120. Alfred Music.. modal mixture, substitutedWhite (1911), p.42. modal interchange) is a chord borrowed from the parallel key (minor or major scale with the same tonic).

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Cadence (music)

In Western musical theory, a cadence (Latin cadentia, "a falling") is "a melodic or harmonic configuration that creates a sense of resolution."Don Michael Randel (1999).

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Dominant seventh chord

In music theory, a dominant seventh chord, or major minor seventh chord, is a chord composed of a root, major third, perfect fifth, and minor seventh.

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Ii–V–I progression

The ⅱ–Ⅴ–I progression (occasionally referred to as ⅱ–Ⅴ–I turnaround, and ⅱ–Ⅴ–I) is a common cadential chord progression used in a wide variety of music genres, including jazz harmony.

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Jazz

Jazz is a music genre that originated in the African-American communities of New Orleans, United States, in the late 19th and early 20th centuries, and developed from roots in blues and ragtime.

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Leading-tone

In music theory, a leading-note (also subsemitone, and called the leading-tone in the US) is a note or pitch which resolves or "leads" to a note one semitone higher or lower, being a lower and upper leading-tone, respectively.

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Mediant

In music, the mediant (Latin: to be in the middle) is the third scale degree of a diatonic scale, being the note halfway between the tonic and the dominant.

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Modulation (music)

In music, modulation is most commonly the act or process of changing from one key (tonic, or tonal center) to another.

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Seventh (chord)

In music, the seventh factor of a chord is the note or pitch seven scale degrees above the root or tonal center.

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Subtonic

In music, the subtonic is the scale degree below the tonic or, more specifically, the flattened seventh (VII): the lowered or minor seventh degree of the scale, a whole step below the tonic, as opposed to the leading tone, which is only a half step below the tonic.

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Tonic (music)

In music, the tonic is the first scale degree of a diatonic scale (the first note of a scale) and the tonal center or final resolution tone that is commonly used in the final cadence in tonal (musical key-based) classical music, popular music and traditional music.

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