Just so there's no misunderstanding (remember the scandal surrounding little girl singing at the Beijing Olympics?), organizers at the 2012 games in London have confirmed that yes, they will be using pre-recorded music as part of the ceremonies. From the BBC:
Artists will record songs before the events and sing over the tracks on stage, said a Locog spokeswoman.
The move has been criticised by the Musicians Union, which has asked ceremonies organisers to reconsider.
"It's not too late," Horace Trubridge, MU assistant general secretary, told the BBC.
"It would have a fantastic impact on the night and send out a message to everyone in the world about just how great we are live."
Locog said it is standard practice to play pre-recorded music at such a large event.
"Due to the complexities of everything involved in staging the ceremonies, it's not possible for the music to be live," said a spokeswoman.
She added that the performers did not have an issue with the plan.
"There will be live musical elements but many of the songs will be recorded in advance of the show."
Well, at least they're being honest, right? Read more here.