Sixteen bar blues

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The sixteen bar blues can be a variation on an eight bar blues or the more standard twelve bar blues.

Any standard eight bar pattern can be viewed as a sixteen bar pattern played at twice the speed with the measures repeated.

More commonly, a sixteen bar blues is an extension of a twelve bar progression. In order to form a sixteen bar blues progression, the 9th and 10 chords are repeated:

twelve bar progression
T T T T
S S T T
D S T T
Twelve bar boogie-woogie blues in C.mid Play in C
sixteen bar progression
T T T T
S S T T
D S D S
D S T T
Sixteen bar boogie-woogie blues in C.mid Play in C
Note (one chord per measure)

A famous example of this blues progression is "Watermelon Man" by Herbie Hancock. "Let's Dance," written and made famous by Chris Montez and made famous by the Ramones, employs a variation in which the dominant-subdominant transition is repeated only once, with two additional bars of the tonic substituted for the second repetition (for an overall progression of I-I-I-I / IV-IV-I-I / V-IV-V-IV / I-I-I-I).

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