Prince Charles, Prince Harry and HM The Queen's appearances [and input] on "Sing" by Andrew Lloyd Webber and Gary Barlow. The song can be found elsewhere if you wish to hear it.
Oh my god, that was totaly awesome... I cry and just can't get enought of this song... Isn't it awesome how music can conect people? I want to belive in the good side in humans again...
The full programme was available for one week only on BBCiplayer. The video for the song is on RU-vid and can be found by simply searching "Gary Barlow Sing".