This article describes the 21st album in the UK Now! series. It should not be confused with identically-numbered albums from other Now! series. For more information, see Now That's What I Call Music! 21 and Now That's What I Call Music! discography. Now That's What I Call Music! 21 or Now 21 is the 21st edition of the Now! series released in the United Kingdom. It was released on 13 April 1992 as an LP, on audio cassette and CD.