"The Age of Spectacle starts here"

When Bob Geldof exhorted audiences to fill Wembley Stadium and empty their pockets for famine relief in Ethiopia, he changed the face of charity fundraising – and of live music. On its 40th anniversary, David Hepworth – one of the BBC presenters on the day – explores the legacy of Live Aid

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If not quite the moon landing or the shooting of JFK, 13 July 1985 remains a day on which most people who were alive remember exactly where they were - a day marked by a seismic social and cultural shift.

The defining moment came around seven o'clock in the evening. Queen, a rock band whose star had seemed to be on the wane, was performing 'We Will Rock You' at Wembley Stadium. The audience seemed almost possessed - overwhelmed at simply being part of the occasion. Frontman Freddie Mercury pointed the cameraman at the crowd - more than 70,000 people clapping in perfect synchrony, hands above their heads.

In this instant was born a new age of musical performance that would be notable as much for what things looked like as for the way they sounded. The road to today's special-effects-packed, big-ticket concert experience was laid at Live Aid. The Age of Spectacle started here.

Essential viewing

What was to climax with a TV event that everybody watched because they wanted to began with a TV event that many watched because they had little choice. That was Michael Buerk’s report from the camps on the plain of Korem in Ethiopia's Tigray region where, in October 1984, many thousands were dying as a result of famine and war.

Bob Geldof was at home on the evening of Buerk’s broadcast - because his career as the lead singer of The Boomtown Rats was no longer quite as chart-busting as it had been. Moved and enraged by what he saw, he took the prodigious energy that would ordinarily have been put into plugging a new single, and dragooned his pop mates into singing on a charity record.