To mark the Live Aid anniversary, the BBC and CNN have co-produced a documentary series, “Live Aid: When Rock ’n’ Roll Took On the World.” It also covers Band Aid and Live 8, concerts that Geldof organized in 2005 that helped pressure the world’s richest countries to cut the debt owed by the poorest countries and increase aid spending.

Following the all-star Band Aid "Do They Know It's Christmas?" benefit single the previous December, it was 20-odd hours of music transmitted globally by 16 satellites to 169 countries, for a reported audience of nearly two billion.

By Hanna Rantala LONDON (Reuters) -Musicians who performed at Live Aid, the transatlantic concert that raised millions for famine relief in Ethiopia, reunited in London on Sunday to mark the event's 40th anniversary,