they could be singing with the playback so its not like they aren't singing I was watching them sing this song on another video and if you listen carefully you can clearly hear them singing with the over lap this performance you don't so maybe this one they thought it was a big deal and didn't want to mess up
@completemystery I wasn't saying that it's easy to sing and dance at the same time. I was just pointing out how obvious it is that they not actually singing.
@tweety11491 actually if you did let's say "Just dance" series on Wii or something like that! You would know that it is extremely hard to sing and dance at the same time. But I do get what you're saying.
