This refers to a mixture of jazz and country blues often played on a mixture of basically simple instruments such as the guitar, harmonica, jug, kazoo, and washtub bass. Although the term Skiffle was originally used in the U.S. in the 1930s to describe mixtures of blues, boogie woogie, and other popular black music, the skiffle revival of the 1950s – as typified by Lonnie Donegan's recording of "Rock Island Line" – was most pronounced in Great Britain, where it remained popular until the style was replaced by rock & roll at the end of the decade. Major skiffle artists include Chris Barber and Ken Colyer