Skiffle is a music genre with jazz, blues, folk and roots influences, usually using homemade or improvised instruments. Originating as a term in the United States in the first half of the 20th century, it became popular again in the UK in the 1950s, where it was associated with artists such as Lonnie Donegan, The Vipers Skiffle Group, Ken Colyer and Chas McDevitt. Skiffle played a major part in beginning the careers of later eminent jazz, pop, blues, folk and rock musicians and has been seen as a critical stepping stone to the second British folk revival, blues boom and British Invasion of the US popular music scene.