1. Someone had the idea for this and thought it was a good enough idea to propose to others.
2. Others agreed that it was a good idea.
3. As the choir practiced, they still thought this was a good idea.
4. During rehearsals, other people saw this performance and thought it was a good idea.
5. This was performed before a world wide audience.

I find each of these steps individually remarkable, and stupefying in aggregate.