I don't know about Justin.I hate that kid and don't even wanna talk about it but probably he did in the most parts.
Eminem..well In some parts i thought he is lip syncing but not sure cause I haven't seen Eminem live before.
Usher.yea I think he was lip syncing.specially in some parts of the dance scenes you could tell that he is lip syncing
and I don't know about Nikki and will i am cause I didn't even listen to their song.I was thinking about something else In that time.LOL
Yea I agree Florence was singing.It was obvious
Not sure about Taylor but It seemed that she was singing.yea.70%
Rihanna..I agree she was singing too
and I think Hayley had one of the est performances.I hadn't seen her live before but she is actually good.good vocal.I'm not a Paramore fan but I really like her performance :)
so yea.That's it :)