^ I don't think that it's because of the vocals that they're not playing KtS anymore (or at least not as much as before). Musically, this song is quite hard for lead guitar and keys. Last time I saw that song live, it was quite disapointing to say the least and, for me, the disapointment didn't come from the change in the vocals. If they could at least nail all the notes, it would be a nice improvement. But then again, they probably focus more on the newer albums when they rehearse so that's probably one of the main reasons.