Miming.
I had the unfortunate experience of seeing DD on the first date of their comeback tour, 2005?
My wife's sis was a DD fan back in the day and arranged for her and her hubby and my wife and I to see them in Nottingham.
I only went because Goldfrapp were supporting, they were excellent. Then, DD came on.
After false starts to songs, out of time, tune reditions of "classics" and hearing men in their 30's and 40's screaming with deight at the sight of Si and Co, I turned to my wife and said "I think I'm in hell".
I went outside and smoked for the rest of the gig.