There are many different forms of blues: the Delta style of Robert Johnson, the hard Chicago blues of Buddy Guy, the Texas swagger of Stevie Ray Vaughan and the psychedelic blues rock of Jimi Hendrix.

Consistently rated as one of the most important guitarists of all time, Eric Clapton is oft-credited as a major influence on the changing sound of electric blues in the 1960s. And, after switching ...

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