Old, as well as many new, music CDs do not contain artist name, album and song titles, but MP3, AAC and other compressed audio formats include fields called "tags" for this data (see ID3 tag).

It turns out that famed artist Banksy put about 500 fake ... It's the U.K. release of Now That's What I Call Music 4, the first one ever put on CD. Only 500 copies were originally pressed, but ...