One user at YT left this recollection of this event:
This was the winter of '76-'77 in the Olympic stadium...they went there for a Rehersal to see what will be the sound for their incoming Aug. 26 1977 show in Montreal.
I was there! I saw the trucks comming there to dump the stock there for this rehersal!
And i was there for this amazing show.
Great memories......

Personal memories of this year, twas the first concert I missed (12 yrs old) Brain Salad Surgery Tour, ELP opened for Lynnard Skynnard in Dallas, parents went, all they could say about ELP was their ears hurt they were so loud.......Lightweights!!!!

The rock legend is that ELP recorded this and then found out that an elderly Aaron Copeland personally held the rights to record and perform his composition. They visited the composer at his home and played a tape of their version for his approval. He was delighted and reportedly said that when he was composing the song in his head he dreamed it could have the kind of power and impact that the ELP performance had given it for the first time in the thousands of performances he had heard. Magnificent music.

since i am such a geek, one of the reasons this clips excites me is the monster synth:
http://en.wikipedia.org/wiki/Yamaha_GX1

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This video has been declared non-functional; embed code must be fixed within 2 days or it will be sent to the dead pool - declared dead by campionidelmondo.

rasch187 has fixed this video's dead embed code - no Power Points awarded because rasch187's points are already fully charged.

Tags for this video have been changed from '70s, live, British, Copeland, Works, Americana' to '70s, live, British, Copland, Works, Americana, Fanfare for the Common Man' - edited by Ornthoron

Wonderful! This video was posted on the day I signed up for VideoSift and was, if I remember correctly, the first video I voted up.

Here's the original for comparison:
http://videosift.com/video/Fanfare-for-the-Common-Man-Aaron-Copland

The thumbnail image for this video has been updated - thumbnail added by Ornthoron.

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*promote

The duration of this video has been updated from unknown to 8:54 - length declared by Ornthoron.

Promoting this video back to the front page; last published Friday, September 26th, 2008 1:59pm PDT - promote requested by Ornthoron.

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This video has been declared non-functional; embed code must be fixed within 2 days or it will be sent to the dead pool - declared dead by chicchorea.

Awarding lurgee with one Power Point for fixing this video's dead embed code.