Blimey, that's a really annoying song! Was number 1 for weeks wasn't it? Sure felt like it
My wife was in control of the timing of this song at the Millennium show in London.
She had to keep in contact with the group through radio earpieces telling them to speed up a quarter beat or slow down a half beat etc.
There was no way to rehearse it so they had to sign a contract to be explicitly guided by her timings. If it had gone wrong she would have been in deep schtuck. Thankfully the group kept their half of the bargain and it went of flawlessly.