Jak ja uwielbiałam ten ich taniec do tej piosenki! Pamiętam, ze ich występ nagrałam sobie i potem męczyłam koleżankę, żeby ze mną tak tańczyła ;p Ech, kiedy to było...
If you'd listened carefully, they AREN'T lip-syncing. You can actually hear the feedback from their mics, something like muffled vibrations, & it's caused by the stationary soundwaves from their voices hitting the sound dectector too hard. & if you own their album, play it next to this, & you'll hear the difference. Marie doesn't project her voice that hard on the album, unlike here.
i just played them together and this "live" performance did have feedback BUT i also listened to prerecordings of them and they matched. so this is not live.