Otis Redding in 1967. Redding was also known as "The Mad Man From Macon." Michael Ochs Archives/Getty Images hide caption

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Duane Allman of The Allman Brothers Band lived to play music. A new box set, Skydog, collects the legendary body of work he produced before his death in 1971. John Gellman/Courtesy of the artist hide caption

itoggle caption John Gellman/Courtesy of the artist

Muddy Waters pioneered Chicago's now-signature electric blues. Keystone/Getty Images hide caption

itoggle caption Keystone/Getty Images