And the singer is ...

The Olympic organizing committee has just let the cat out of the bag by revealing how fireworks will be used during the opening ceremony. We now know they can display the five rings in the sky, since a fireworks rehearsal is pretty hard to keep hush-hush.

A theme song, however, can be rehearsed in the privacy of a studio or even a living room. That makes it much more difficult to predict who will sing the all-important tune, which will be guaranteed a zillion air plays in the next year.

The CCTV annual gala might well have given us several clues, though.