The Associated Press

CUPERTINO, Calif. (AP) - Apple Inc. has officially set Sept. 9 as the date for its next music-themed product launch event in San Francisco.

Apple unveiled redesigned iPod Nano music players at a similarly timed event last year.

The iPod and iPhone maker sent an invitation to journalists Monday morning that reads, "It's only rock and roll, but we like it," borrowed from a Rolling Stones lyric.

Apple keeps a tight lid on upcoming products and hasn't confirmed any rumored developments, including a plan to package extra digital content with albums sold on iTunes, and a new tablet-style device.