Of course, it's a kind of weird situation, because it's not like they're being asked to be the musical guest for a real SNL-type show - I mean, they're not going to get that much air time, or anything. So I can see that some of the really hot groups right now wouldn't want to bother. Plus the target audience for Studio-60-the-sketch-show is different than the audience for Studio-60-the-network-behind-the-scenes-show, at least according to the data they've gathered about who is actually watching.