One artist that did appear onstage during the London finale but went relatively unnoticed was Yussef Islam, a.k.a. Cat Stevens. He had even written a song for the show, but due to time constraints didn't perform it.
It went very quickly. The greatest moment of my life, and it just flashed by.
In its original form, the concert ran 16 hours. There were two versions of the U.S. telecast - one incarnation aired complete on MTV, another produced by ABC was in two parts, part one (the first eleven hours) airing in syndication, part two (the final three hours) airing on ABC. In any case, the DVD version is edited to ten hours, leaving out many key performances, such as Crosby, Stills, Nash and Young, Power Station, The Hooters, The Four Tops, Rick Springfield, Bernard Watson, Santana, and Led Zeppelin. The DVD version also contains an aurally altered version of Paul McCartney's performance of "Let It Be" (due to a microphone problem in the first half of the song, McCartney had to re-record his vocals twenty years after the fact so that it could be included on the DVD).