Now That's What I Call Music! 63 or Now 63 was released in the United Kingdom on 10 April 2006. The album is the 63rd edition of the original Now series in the United Kingdom. It was released on Compact Disc, audio cassette, and digital MP3 download via digital music retailers. This was the second-to-last UK Now album to be released on audio cassette, the first album being NOW 1, and only a limited number of copies were made available. Compact Disc remains as the largest-selling format to this day.