Apple plans a special iPod-focused, invite-only event on September 7.

Invitations sent to media organizations in the US and UK declare: "1,000 songs in your pocket changed everything. Here we go again."

The invitation seemingly refers to the first-generation 5GB iPod, which revolutionized the music player category, most commentators agreed - if only by making digital music a more mainstream practice.

As a measure of the significance of the date, the US event takes place at the Moscone Center in San Francisco, while a UK event is also planned on the same day, Macworld can confirm.