‘The Grey Album’ is a mashup album by Hip-Hop producer & DJ, Danger Mouse, released in 2004. The album is comprised of vocals from JAY-Z’s 2003 studio album ‘The Black Album’ and small snippets of The Beatles' eponymous 1968 album (often referred to as ‘The White Album’ due to its blank album cover).
Despite the approval of both living Beatles members, Starr and McCartney, as well as JAY-Z himself, the album is very hard to acquire due to copyright laws.