Howlin' Wolf, Muddy Waters, Willie Dixon, and Jimmy Reed played in Chicago in a style characterized by the use of electric guitar, sometimes slide guitar, harmonica, and a rhythm section of bass and drums. In the late 1950s, a new blues style emerged on Chicago's West Side pioneered by Magic Sam, Buddy Guy and Otis Rush on Cobra Records. The 'West Side Sound' had strong rhythmic support from a rhythm guitar, bass guitar and drums and as perfected by Guy, Freddie King, Magic Slim and Luther Allison was dominated by amplified electric lead guitar. Other blues artists, such as John Lee Hooker had influences not directly related to the Chicago style. John Lee Hooker's blues is more "personal," based on Hooker's deep rough voice accompanied by a single electric guitar.