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Eight-bar blues progressions have more variations than the more rigidly defined twelve bar format. The move to the IV chord usually happens at bar 3 (as opposed to 5 in twelve bar); however, "the I chord moving to the V chord right away, in the second measure, is a characteristic of the eight-bar blues." [1]
Sometimes, especially in blues music, musicians will take chords which are normally minor chords and make them major. The most popular example is the I–VI–ii–V–I progression; normally, the vi chord would be a minor chord (or m 7, m 6, m ♭ 6 etc.) but here the major third makes it a secondary dominant leading to ii, i.e. V/ii.
In the case of the lowered third over the root (or the lowered seventh over the dominant), the resulting chord is a neutral mixed third chord. Blue notes are used in many blues songs, in jazz, and in conventional popular songs with a "blue" feeling, such as Harold Arlen's "Stormy Weather". Blue notes are also prevalent in English folk music. [5]
In a jazz band, these chord changes are usually played in the key of B ♭ [7] with various chord substitutions.Here is a typical form for the A section with various common substitutions, including bVII 7 in place of the minor iv chord; the addition of a ii–V progression (Fm 7 –B ♭ 7) that briefly tonicizes the IV chord, E ♭; using iii in place of I in bar 7 (the end of the first A ...
In some conventions (as in this and related articles) upper-case Roman numerals indicate major triads (e.g., I, IV, V) while lower-case Roman numerals indicate minor triads (e.g., I for a major chord and i for a minor chord, or using the major key, ii, iii and vi representing typical diatonic minor triads); other writers (e.g., Schoenberg) use ...
The song conveys the feel and tone of a blues song, but does not follow any of the usual eight-bar blues or twelve-bar blues progressions. The song has harmonic resemblance to Howlin' Wolf's recordings of "Sitting on Top of the World" in its inclusion of a minor IV chord in the fourth measure of the progression, while also harmonically resembling "Trouble in Mind", a blues standard. [3]
The sixteen-bar blues can be a variation on the standard twelve-bar blues or on the ... subdominant, and tonic chords (bars 9, 10, and 11–12, respectively) are ...
The minor pentatonic scale is often used in blues improvisation, and like a blues scale, a minor pentatonic scale can be played over all of the chords in a blues. The following pentatonic lick was played over blues changes by Joe Henderson on Horace Silver's "African Queen" (1965). [180]