I don't see what people are complaining about. Of course there wont be instruments, the PSP is a handheld. If you were to play Rock Band in the bus, or whereever, you wouldn't want periphirals, just the game.
I just hope there will be some kind of connection between RB:U and whatever Rock Band you have for your PS3. Maybe just having a price reduction on songs you already bought in one of the PS3 games.







