Queen’s set opened to massive cheers with "Bohemian Rhapsody", and the amazing charismatic performance of lead singer Freddie Mercury got the entire Wembley crowd of 82,000 clapping in unison to "Radio Ga Ga" and "Crazy Little Thing Called Love" before singing along, word-for-word, to "We Will Rock You" and "We Are the Champions". The band's performance, also including "Hammer to Fall", led to Queen's slot being voted in a recent poll (by fans and musicians alike) as the "GREATEST LIVE GIG EVER".

Live Aid was a multi-venue rock music concert held on July 13, 1985. The event was organized by Bob Geldof and Midge Ure to raise funds for famine relief in Ethiopia. Billed as the 'global jukebox', the event was held simultaneously in Wembley Stadium, London (attended by 82,000 people) and JFK Stadium, Philadelphia (attended by about 99,000 people). On the same day, concerts inspired by the initiative happened in other countries, such as Australia and Germany. It was one of the largest-scale satellite link-ups and television broadcasts of all time: an estimated 1.5 billion viewers, across 100 countries, watched the live broadcast.

The Republic of Ireland gave the most donations per capita, despite being in the throes of a serious economic depression at the time. The single largest donation came from the ruling family of Dubai. They donated 1 million pounds in a phone conversation with Geldof.
The final figure of money raised was 150 million pounds, (approx. $283.6 million).

Complete info here:
http://en.wikipedia.org/wiki/Live_Aid