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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 iv 7 to ♭ VII 7 to I (the tonic or "home" chord) has been nicknamed the backdoor progression [1] [2] or the backdoor ii-V, as described by jazz theorist and author Jerry Coker.
A common chord progression with these chords is I-♭ VII–IV-I, which also can be played as I-I-♭ VII–IV or ♭ VII–IV-I-I. The minor-third step from a minor key up to the relative major encouraged ascending scale progressions, particularly based on an ascending pentatonic scale. Typical of the type is the sequence i–III–IV (or iv ...
The progression is also used entirely with minor chords[i-v-vii-iv (g#, d#, f#, c#)] in the middle section of Chopin's etude op. 10 no. 12. However, using the same chord type (major or minor) on all four chords causes it to feel more like a sequence of descending fourths than a bona fide chord progression.
A contrafact is a musical composition built using the chord progression of a pre-existing song, but with a new melody and arrangement.Typically the original tune's progression and song form will be reused but occasionally just a section will be reused in the new composition.
Staind also uses this tuning (but with the 2nd string tuned up 1/2 step to emulate a 7-string guitar), as well as several other modified variations of this, such as one in which the 5th string is also dropped from D# to C#. Periphery also uses this tuning on a 7-string guitar frequently (G#-D#-g#-C#-F#-A#-D#). Drop G – G-D-g-C-E-A
Dropping the first voice is undefined—a drop-1 voicing would still have all voices in the same octave, simply making a new first voice. This nomenclature doesn't cover the dropping of voices by two or more octaves or having the same pitch in multiple octaves. A drop-2 voicing lowers the second voice by an octave.
The most basic three-chord progressions of Western harmony have only major chords. In each key, three chords are designated with the Roman numerals (of musical notation): The tonic (I), the subdominant (IV), and the dominant (V). While the chords of each three-chord progression are numbered (I, IV, and V), they appear in other orders.
The irregularity has a price. Chords cannot be shifted around the fretboard in the standard tuning E–A–D–G–B–E, which requires four chord-shapes for the major chords. There are separate chord-forms for chords having their root note on the third, fourth, fifth, and sixth strings. [44] These are called inversions.