Increasingly they adopted a loud amplified sound, often centered on the electric guitar, based on the Chicago blues, particularly after the tour of Britain by Muddy Waters in 1958, which prompted Cyril Davies and guitarist Alexis Korner to form the band Blues Incorporated.
Cada vez máis foron adoptando un forte son amplificado, a miúdo centrado ao redor da guitarra eléctrica, baseado no blues de Chicago, particularmente despois da xira británica de Muddy Waters en 1958, que levou a Cyril Davies e ao guitarrista Alexis Korner a formar o grupo Blues Incorporated.