It’s happened every September for the past few years, and it appears it’s on track again: Apple is planning a keynote event rumored to take place the second week of September.

Time to get the rumor mill kicked into high gear: Multiple music industry sources say Apple executives have told them the company is planning one of its famed keynote events for the week of Sept. 7. “according to AllThingsD’s Peter Kafka”

But in true Apple fashion, the company has been noncommittal about the exact date of the event and what it will be showing off..

Apple has traditionally held media-focused keynote event each September to introduce new iTunes features and iPod updates, making the announcement of a similar event this year an unsurprising move.

- 2008: Apple held a ”Let’s Rock” event to introduce iTunes 8 and new iPod touch, nano, and shuffle models.

- 2007: Apple held a ”The Beat Goes On” event introducing the original iPod touch alongside updates to the remainder of the iPod line, an iTunes 7.4 update, and iPhone price drops.

- 2006: Apple offered the ”It’s Showtime” event introducing iTunes 7 and iPod updates, as well as a sneak peak at the “iTV” that launched several months later as the Apple TV.

- 2005: Apple’s ”Here We Go Again” event introduced the Motorola ROKR mobile phone with iTunes support alongside the release of iTunes 5 and saw the introduction of the original iPod nano to replace the iPod mini.

We’ll Have to wait and see what goes on!