Thanks guys!
All of the replies were very helpful. I too have heard about the technique about playing the song twice as fast and then putting the footage in slow motion in post, but I didn’t really understand the whole process until now. Thanks for the explanations!
The backwards lip syncing seems interesting, too. I’ll experiment with some test shots to see if I can incorporate that trick into the music video.
If anyone else has some more input about the technique feel free to share! Thanks again!