Now That's What I Call Music! 64 or Now 64 is the 64th edition of the original UK Now series. It was released on 24 July 2006 on digital MP3 download, audio cassette, and compact disc. This was the final (UK) NOW edition to be released on audio cassette, and only a very limited number of copies were made available. Compact Disc remains as the largest-selling format to this day.