Eight bar blues
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An eight bar blues is a typical blues chord progression, taking eight 4/4 bars to the verse. "How Long Blues", "Ain't Nobody's Business" and "Cherry Red" are examples. One variant is to couple an eight-bar blues with a different eight-bar blues bridge to create a blues variant of the standard 32-bar song. "Walking By Myself", "I Want a Little Girl" and "(Romancing) In The Dark" are examples of this form. See also blues ballad.
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.)
Worried Life Blues (probably the most common eight bar blues progression):
|I |I |IV |IV | |I |V |I IV |I V |
Key to the Highway (variation with the V at bar 2):
|I |V |IV |IV | |I |V |I |V |
Walking By Myself (somewhat unorthodox example of the form):
|I |I |I |I | |V |IV |I |V |
(The same chord progression can also be called a sixteen-bar blues, if each symbol above is taken to be a half note in 2/2 or 4/4 time -- blues has not traditionally been associated with notation, so its form becomes a bit slippery when written down.) Ray Charles's jazzy instrumental "Sweet Sixteen Bars" is an example.
