Katy Perry has always been hit and miss when it comes to performing live, but at least most of the time she can disguise her vocals behind big productions. Well, on Sunday’s Beatles tribute, she did an acoustic take on the classic “Yesterday”, and viewers weren’t too kind. Knowing Katy’s history, I don’t think her performance is that bad, but there’s a lot of people that think otherwise. People aren’t very impressed either that she changed some of the lyrics. What do you think?