It’s the music from the Pandemonium sequence (you know, the one with the chimneys). It’s a belter.
1. When the ceremony began with a countdown featuring a different London landmark every second.
BBC / Olympics / Via youtube.com
BBC / Olympics / Via youtube.com

BBC / Olympics / Via youtube.com
And you annoyed everyone by shouting, “OH, I’VE SEEN THAT ONE.”
2. Followed by the “Isle of Wonder” video consisting of this insane journey down the Thames.
