"I was worried it would be world music the whole night so I wanted to do a proper rock 'n' roll song," Geldof said.
However, producers weren't so sure, telling the Boomtown Rat the song was 'too noisy' when they heard him tearing through it at rehearsals.
But Band Aid/Live Aid Bob is, after all, the king of persuasion.
"I told them I had to do this song, as the people know me as a noisy person with noisy songs, and that the Irish people are themselves noisy. Furthermore, that Aung San Suu Kyi is a noisy person," added Bob.
The cover was one of the highlights of the concert which, The Diary can reveal, will feature on a TV documentary about Aung San Suu Kyi's visit to Ireland.
Many of the performers taking part gathered at the Hard Rock Cafe in Fleet Street later for an afterparty.