The internet at large has been joking about it long enough -- "hey, where's Keyboard Hero?" Well, here it is. We're on the fence on how to describe our experience with Rock Band 3's not-a-keytar, because in many ways it's reflective of your own thoughts on the rhythm genre and pianos in general. Those with actual musical backgrounds are likely to scoff at the easy mode's lumping of half-octaves into groups of colored notes -- eve