Celebrities , who gather in London to celebrate Mandela 's 90th birthday . Mandela at outdoor concert in his honor in London 's Hyde Park . Crowd of thousands sing ` ` Happy Birthday '' led by Will Young . Mandela consistently refused to compromise his political position to obtain his freedom . Performers include Amy Winehouse , Adele , Annie Lennox , Simple Minds .
Celebrities , who gather in London to celebrate Mandela 's 90th birthday . Mandela at outdoor concert in his honor in London 's Hyde Park . Crowd of thousands sing ` ` Happy Birthday '' led by Will Young . Performers include Amy Winehouse , Adele , Annie Lennox , Simple Minds .