The Beatles may have signed up to iTunes, but still missing are . . .

▶ AC/DC - The makers of the second bestselling album in history, Back in Black, refuse to make their tracks available individually.

▶ Jay-Z - Most of the rapper's work is available, but not his American Gangster album: "this collection will not be sold as individual singles."

▶ Frank Zappa - The Zappa catalogue was removed from iTunes by his widow.

▶ Kid Rock - Because there are no packaging or distrubution costs on iTunes, argues the US rock-rap crossover star, artists should get a much higher royalty.