Chicago blues is a form of blues music that developed in Chicago, Illinois. It is based on earlier blues idioms, such as Delta blues, but is performed in an urban style. It developed alongside the Great Migration of African Americans of the first half of the twentieth century. Key features that distinguish Chicago blues from the earlier traditions, such as Delta blues, is the prominent use of electrified instruments, especially the electric guitar, and especially the use of electronic effects such as distortion and overdrive.

British blues is a form of music derived from American blues that originated in the late 1950s, and reached its height of mainstream popularity in the 1960s. In Britain, blues developed a distinctive and influential style dominated by electric guitar, and made international stars of several proponents of the genre, including the Rolling Stones, the Animals, the Yardbirds, Eric Clapton, Fleetwood Mac and Led Zeppelin.