From the Live Aid article at Wikipedia:
Queen galvanised the stadium with some of their greatest hits, in which lead singer Freddie Mercury at times led the entire crowd of 72,000 in thundering unison refrains. In their 20 minute set the band opened with “Bohemian Rhapsody” and closed with “We Are the Champions”. They extensively rehearsed their performance at London’s Shaw Theatre. Prior to their taking the stage, Queen’s sound engineer covertly switched out the limiters that had been installed on the venue’s sound system so the performance would be louder than the others. Queen’s performance on that day has since been voted by more than 60 artists, journalists and music industry executives as the greatest live performance in the history of rock music.
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