Backdoor Cadence
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Backdoor Cadence
Backdoor compared with the dominant (front door) in the chromatic circle: they share two tones and are transpositionally equivalent

In jazz and jazz harmony, the chord progression from iv7 to VII7 to I (the tonic or "home" key) has been nicknamed the backdoor progression[1][2] or the backdoor ii-V, as described by jazz theorist and author Jerry Coker. This name derives from an assumption that the normal progression to the tonic, the ii-V-I turnaround (ii-V7 to I, see also authentic cadence) is, by inference, the "front door", a metaphor suggesting that this is the main route to the tonic.

The backdoor progression can be found in popular jazz standards in such places as measures 7 and 8 of the A section of "Cherokee," measures 9 and 11 of "My Romance" or measures 10 and 28 of "There Will Never Be Another You," as well as Beatles songs like "In My Life" and "If I Fell."[]

The VII7 chord, a pivot chord borrowed from the parallel minor of the current tonic major key, is a dominant seventh. Therefore, it can resolve to I; it is commonly preceded by IV going to iv, then VII7, then I. In C major the dominant would be G7: (the notes GBDF), sharing two common tones with B7: (the notes BDFA). The notes A and F serve as upper leading-tones back to G and E (when the chord moves to the tonic, C major), respectively, rather than B and F serving as the lower and upper leading-tones to C and E in a conventional G7-C major (V7-I) cadence.

Alternative usage

Berg's "Backdoor progression" to iii, with I in place of iii: ivø7-VII7(9)-Imaj9 About this sound Play .

The term "Backdoor" has been used by author Shelton Berg to refer to another entirely unrelated progression. The unexpected modulation created through the substitution of the highly similar Imaj9 for iii7 (in C: CEGBD and EGBD) at the end of the iiø7-V7 turnaround to a tonicized iii (iiø7/iii=ivø7, V7/iii=VII7, iii), arrives at 'home' (the temporary tonic of iii) through unexpected means, the 'back door' instead of the 'front door'(iii7, the individual notes EGBD, being entirely contained within Imaj9, the individual notes of the C major chord, CEGBD, and the seventh of the dominant seventh chord still resolving downward).[3] The resolution of a dominant seventh chord up a step (in this case a half-step, also called a semitone) is called a deceptive cadence.

See also

Sources

  1. ^ Coker, Jerry (1997). Elements of the Jazz Language for the Developing Improvisor, p.82. ISBN 1-57623-875-X. "Back Door Progression As A Substitute For V7[:] The I chord, in a given progression, is often preceded by IV-7 to VII7, instead of the usual V7 chord.".
  2. ^ Juusela, Kari (2015). The Berklee Contemporary Dictionary of Music, unpaginated. Hal Leonard. ISBN 9781495028540. "back-door cadence: A IVmi7 VII7 I harmonic cadence."
  3. ^ Berg, Shelton (2005). Essentials Of Jazz Theory, p.105. Alfred Music. ISBN 0-7390-3089-2.

  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

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