"Not being able to address the attribution of change in the early 20th century to my mind precludes any highly confident attribution of change in the late 20th century."

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Because the blues is the basis of most American music in the 20th century. It's a 12-bar form that's played by jazz, bluegrass and country musicians. It has a rhythmic vocabulary that's been used by rock n' roll. It's related to spirituals, and even the American fiddle tradition.

— Wynton Marsalis