Now, nearly 35 years later, Raitt is still moaning the blues and playing her trademark slide guitar, which is heard on her latest album, Souls Alike.

NPR: Bonnie Raitt: 'Souls Alike'

Among them was the Robert Johnson classic "Walking Blues, " with Raitt on slide guitar and bluesman Junior Wells on harmonica.

NPR: Bonnie Raitt: 'Souls Alike'

Slim cut his first single, Scufflin, in 1966 and became a Chicago blues fixture in his own right, developing a guitar style that blended a distinct vibrato with a slide-guitar-like sound formed with his bare fingers against the strings.

BBC: Magic Slim, American blues musician, dies aged 75