The Portable Gamer writes:
"Let's get a few pieces of information that have been confirmed out of the way: It does exist, and will be released for PSP. It will contain an in-game Music Store, which means that the PSP's downloadable options just got that much sweeter.
Now with that out of the way, I'll try to tackle a few questions; questions like "How will this work? Will it have peripherals? Is Harmonix at the helm?" Get ready for the fun part: speculation."