Sarah Brightman will team up with Chinese singer Liu Huan to perform
the official theme song at the opening ceremony of the Beijing Olympics.The odd couple will perform a duet, which will end the hour-long ceremony on Friday night at the National Stadium. The theme tune is such a big secret, ceremony officials have refused to release the title of the track.It's not the first time British singer Brightman has been chosen to sing an Olympic theme - she dueted with Jose Carreras for the 1992 anthem Amigos Para Siempre at the Barcelona Games in Spain.