The 12-bar blues chord progression is the basis of thousands of songs, not only formally identified blues songs. The vast majority of boogie-woogie compositions are 12-bar blues, as are many instrumentals.
Ray Charles' "What'd I Say" (1959) opens with the twelve bar blues. Other examples of twelve bar blues include Muddy Waters' "Train Fare Blues" (1948), Howlin' Wolf's "Evil" (1954), and Big Joe Turner's "Shake, Rattle, and Roll" (1954). (Covach 2005, p. 67) Duffy also uses the twelve bar blues progression in her song "Mercy".[citation needed]
Examples of altered or extended progressions include Herbie Hancock's "Watermelon Man".(Spitzer 2001,64)
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