He adds in a new BBC documentary about the 40th anniversary of the iconic single that saw some of the world's biggest music stars come together to raise funds for famine victims in Ethiopia, that the rival groups buried "their pettiness" for a day.
The Boomtown Rats singer put together the star-studded line-up in 1984 with Ultravox frontman Midge Ure.
The pop superstars of the day turning out including Bananarama, Bono, Boy George, Duran Duran, George Michael, Paul Young, Phil Collins, Spandau Ballet and Sting.
Over the 24 hours which would make musical history, they rehearsed and recorded their parts and interacted with each other without incident.
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