do you sing? Do you realise how hard it is?

I was just listening to Powderfinger capoicity and it struck me how hard and complicated it was to sing. So many variations all the time.
So I thought I have to listen to this live to see if they can pull it off, I have no idea how they can do it, well how he can do it because it’s just the singing that’s really hard. And indeed he sings it completely differently. Much simpler.
Therefore, the album is absolutely amazing, but it’s physically impossible. They used effects and probably AI or something.