Vogue editor Anna Wintour joined up with U2 last week in New York to host a special screening of the new film "Mandela: Long Walk to Freedom." Little did they know it would be a last musical tribute to the living legend who passed away on Thursday.

The band contributed a song to the soundtrack called “Ordinary Love,” and they took extra care to ensure that their tribute to the great South African leader Nelson Mandela turned out just right.

“It took a while, as all our songs do. We’re very proud of this song and really proud to be a part of this project. As Bono was saying, it was one that we really realized…this we got to get right. You can’t mess this up because it means so much to us and it’s a once in a lifetime opportunity,” guitarist The Edge said.

The Edge and Bono teamed a few years back to write the score for the much-maligned Broadway musical "Spider-Man: Turn Off the Dark," which bowed to bad reviews but excellent box office. The run is set to end early in the New Year, and Bono says bigger and better things loom for the accident-plagued production which cost some $75 million to stage, Broadway’s most expensive show by far.

“Three hugely successful years, and then it’s off to Germany, it’s off to Las Vegas,” Bono said.

 “It was a lot more expensive than it should have been, but in the long term it will – it will do very, very well.”