Sibeko's friend, 37-year-old Khosei Madlala, also from South Africa, exclaimed, "We wouldn't be here, in this world, if it wasn't for him. He has made our dreams come true."
Tim Jebb, a 27-year-old from Ireland, who traveled to London for the concert, said he was impressed by the performances, but he wasn't there for the star-studded lineup.
"The music is fantastic, but I'm really here for Mandela. It wouldn't have mattered who was performing really, I am here to honor Madiba."
The concert capped off a week of activities for Mandela, including a meeting with Queen Elizabeth II and a fundraising dinner on Wednesday attended by guests such as Oprah Winfrey, Elton John, and Bill and Chelsea Clinton. It was at the dinner that Mandela spoke out against the situation in Zimbabwe, saying there had been a "tragic failure of leadership" in the country.
At 9:30 p.m., just after Winehouse performed, Mandela carefully stepped from the top row of the bleachers into a small white elevator, which had been constructed specifically to shuttle him up and down from his seat. Just before stepping into the car, which was waiting for him at the door of the elevator, he took one long look at the crowd of people that had quickly gathered, smiled his characteristically wide grin, and waved goodbye.