In reply to Missy.

You need to listen more closely. If you are a geek about background vocals you will hear that the other girls vocals have noticeably been turned up in this performance. Granted - it was not the girls live vocals (never is) but it sounds like a pre-recorded live vocal (i.e. a vocal recorded on stage pre broadcast with no audience = common performance practice to give a 'live’ that is different to the single version recorded in a studio). When you’ve heard this song live 10 times it’s obvious.