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Generally, successive chords in a chord progression share some notes, which provides harmonic and linear ( Voice Leading ) continuity to a passage. In the Common-practice Period , chord progressions are usually associated with a Scale and the Note s of each chord are usually taken from that scale (or its modally-mixed universe). COMMON PROGRESSIONS The most common chord progressions, in the common practice period and in Popular music, are based on the first, Fourth , and Fifth Scale Degree s ( Tonic , Subdominant and Dominant ); see Three Chord Song , Eight Bar Blues , and Twelve Bar Blues . The chord based on the second Scale Degree is used in the most common chord progression in Jazz , II-V-I . As stated by Tom Sutcliffe on harmony.org.uk: : “… during the 1960's some pop groups started to experiment with modal chord progressions as an alternative way of harmonising blues melodies. . . . This created a new system of harmony that has influenced subsequent popular music.” : “The use of modal harmonies to harmonise the blues came about because of the similarity of the blues scale to modal scales . . . by experimentation with the possible uses of major chords on the guitar. This phenomenon thus probably derives from the characteristics of the guitar and the way it is used in popular music. This is also linked to the rise in the use of power chords.” Sutcliffe’s hypothesis is that major chord combinations such as: I , bIII , IV, V and bVII cannot be explained in pure modal terms as, in this combination, these don’t exist in the usual modes. They have to be explained as a new harmonic system combining elements from the blues and elements from modality. The Circle Of Fifths progression is generally regarded as the most common progression of the Common Practice Period , involving a series of descending perfect fifths that often occur as ascending perfect fourths. The circle of fifths makes up many of the most commonly used progressions, such as II6, V, I in major. Common progressions used in contemporary popular music
REWRITE RULES Steedman (1984) has proposed a set of recursive " Rewrite Rules " which generate all Well-formed Transformation s of jazz, basic I-IV-I-V-I twelve bar blues chord sequences, and, slightly modified, non-twelve-bar blues I-IV-V sequences (" Rhythm Changes "). The original progression may be notated as follows (typical 12-bar Blues ): 1 2 3 4 5 6 7 8 9 10 11 12 I/ I/ I/ I// IV/IV/ I/ I// V/ V/ I/ I Where the numbers on the top line indicate each bar, one slash indicating a bar line and two indicating a phrase marking, and the roman numerals indicating the chord function. Important transformations include
1 2 3 4 5 6 7 8 9 10 11 12 I/IV/I/I7//IV/VII7/III7/VI7//II7/V7/I/I//
...7 8 9... ...III7/bIII7/II7...
Sequences by fourth, rather than fifth, include Jimi Hendrix's version of "Hey Joe": 1 2 3 4 5 6 7 8 9 10 11 12 bVi, bIII/bVII, IV/I/I//bVI, bIII/bVII, IV/I/I//bVI, bIII/bVII, IV/I/I// These often result in Aeolian Harmony and lack Perfect Cadence s (V-I). Middleton (1990, p.198) suggests that both modal and fourth-oriented structures, rather than being "distortions or surface transformations of Schenker's favoured V-I kernel, are more likely branches of a deeper principle, that of tonic/not-tonic differentiation." SOURCES
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