The company on Tuesday issued invitations to media and analysts that showed the now-familiar silhouette of a person with an iPod and the words: "It's only rock and roll, but we like it."
Whether Chief Executive Steve Jobs appears at the Sept. 9 event is unclear, but what is clear is that the iPod has been one of Apple's biggest businesses that has shown a slight market decline.
In its most recently reported quarter, Apple partly blamed an 11 percent decline in iPod revenues on "cannibalization" from the iPhone, which is a phone that doubles as an iPod.
iPods earned $1.49 billion in revenue for the quarter that ended in late July, or about 18 percent of total revenue, making the devices Apple's third-biggest business behind its Macintosh computers and the iPhone.
Some analysts predict that Apple will introduce a digital camera feature in the iPod touch and possibly the classic iPod and iPod nano models. The next version of the iPhone operating system, which also runs on the iPod touch, is said to open up more camera apps.
