The Sugababes (L-R) Heidi Range, Keisha Buchanan and Amelle Berrabah perform at the 46664 concert in honour of Nelson Mandela in Hyde Park, London June 27, 2008.[Agencies]
"Twenty years ago, London hosted a historic concert which called for our freedom," a frail-looking Mandela told the waving crowd after they had sung him "Happy Birthday".
"Your voices carried across the water and inspired us in our prison cells far away.
"As we celebrate, let us remind ourselves that our work is far from complete. Where there is poverty and sickness, including Aids, where human beings are being oppressed, there is more work to be done.