The Three Degrees at The Royal Albert Hall was a 1979 television special produced by the BBC. It was a live concert performance by the American female vocal trio The Three Degrees, who were backed by the London Philharmonic Orchestra at London's prestigious Royal Albert Hall on 8 October 1979. This was The Three Degrees' second television special. Using only the above description and what you know about the world, "The Three Degrees had been on television prior to the 1979 Royal Albert Hall concert. " is definitely correct, incorrect, or inconclusive? 