Could Rock Band Come to the PSP?

Hardcore Christian Gamer Writes: "Now we know that portable devices such as the DS and the iPhone have Guitar Hero and games like Tap Tap Revolution. Windows mobile devices also have a version of Guitar Hero mobile which plays very similar to the DS version without the fret buttons.

Both of the above mentioned platforms have either touch screen functionality or the ability to adapt peripherals to the console itself but the PSP does not. So this got me to thinking, "how can the PSP pull this off?" Being a disc based system you wouldn't have the ability to insert the fret buttons like the DS, and since there is no touch screen functionality the PSP will also be limited. Now don't get me wrong, I would love to play Rock Band on the PSP, as a sucker for music games this seems fun, and the graphics on a PSP are far superior to the DS and most mobile phones."