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In music, a rewrite rule is a recursive ge … In music, a rewrite rule is a recursive generative grammar, which creates a chord progression from another. Steedman (1984) has proposed a set of recursive "rewrite rules" which generate all well-formed transformations 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 typical 12-bar blues progression can be notated 1 2 3 4 5 6 7 8 9 10 11 12I / I / I / I // IV /IV / I / I // V / IV / I / I where the top line numbers each bar, one slash indicates a bar line, two indicate both a bar line and a phrase ending and a Roman numeral indicates the chord function. Important transformations include
* replacement or substitution of a chord by its dominant or subdominant:1 2 3 4 5 6 7 8 9 10 11 12I / IV / I / I7 // IV / VII7 / III7 / VI7 // II7 / V7 / I / I //
* use of chromatic passing chords: ...7 8 9 ......III7 / ♭III7 / II7...
* and chord alterations such as minor chords, diminished sevenths, etc. Sequences by fourth, rather than fifth, include Jimi Hendrix's version of "Hey Joe" and Deep Purple's "Hush": 1 2 3 4 5 6 7 8 9 10 11 12♭VI, ♭III / ♭VII, IV / I / I // ♭VI, ♭III / ♭VII, IV / I / I // ♭VI, ♭III / ♭VII, IV / I / I // These often result in Aeolian harmony and lack perfect cadences (V–I). Middleton (1990) 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." For the ♭ notation, see Borrowed chord.." For the ♭ notation, see Borrowed chord.
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In music, a rewrite rule is a recursive ge … In music, a rewrite rule is a recursive generative grammar, which creates a chord progression from another. Steedman (1984) has proposed a set of recursive "rewrite rules" which generate all well-formed transformations 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 typical 12-bar blues progression can be notated 1 2 3 4 5 6 7 8 9 10 11 12I / I / I / I // IV /IV / I / I // V / IV / I / I Important transformations include For the ♭ notation, see Borrowed chord.de For the ♭ notation, see Borrowed chord.
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