CLEVELAND, Ohio – A guitar virtuoso emerging from the ... had such an identifiable style and wrote songs in that very 12-bar blues framework,” Knowles told Cleveland.com and The Plain ...

A look into the greatest riffs in folk music, covering everyone from Neil Young and Joni Mitchell to Blind Lemon Jefferson and Robert Johnson.

Nearly a decade later, Bill Haley & His Comets employed the same melody over a 12-bar blues to create “Rock Around the Clock,” the first mainstream rock song.