Producers of the new Band Aid single have chosen to use Bono's version of a controversial lyric from the song.
Bono: "I just tried it more of a whisper"
The U2 frontman sings "Well, tonight thank God it's them instead of you" 20 years after singing it the first time.
Darkness star Justin Hawkins had also recorded a version of the line, saying his version was better.
Bono flew into Britain late on Sunday to record the well-known line of Do They Know It's Christmas?, which gets its first radio play on Tuesday.
Bono said he "really, really loathed" the powerful line from the song.
He added: "I hated singing it in the first place. I really didn't want to sing it again."
"I did an impersonation of Bruce Springsteen," said the singer, who was persuaded by Bob Geldof to perform the line in 1984 and had to be persuaded once more to record the lyric.
Madonna has lent her support to the new Band Aid single by recording an introduction to the song's music video.
The pop queen will tell fans to "feed the world" before the video gets its premiere on BBC One on Thursday.
Madonna was not among the stars who assembled to record the song in London at the weekend.
Bono returned from Ireland to record the new rendition and said he took a different approach to his emotional 1984 contribution.
"Rather than that raw, I just tried it more of a whisper tonight," he said.
The Darkness' Justin Hawkins had earlier claimed: "I did it and I did it better than him.
"So his management kicked up a stink and it obviously means a lot to him.
The single will get its first radio play on stations around the UK at 0800 GMT on Tuesday and will be released on 29 November. It will raise money for food aid in Darfur, Sudan.
The video will be unveiled at 1755 GMT on BBC One on Thursday.
"Twenty years ago I performed at Live Aid," she will tell viewers. "You saw me and my generation demanding a change.
"Once again, here we are 20 years later and more people die of hunger in Africa than war and Aids put together.
"In a world of plenty, it is hard to imagine that there are African children going to bed tonight hungry.
"Bob Geldof and his friends are here to remind you that none of us can forget. Not ever. Feed the world. I am honoured to introduce Band Aid 20."
The video will feature stars including Coldplay's Chris Martin, Will Young, Jamelia, Sugababes and Busted, who took part in the recording sessions at the weekend.
The single will be titled Band Aid 20 to mark the 20th anniversary of the original song, which featured stars such as George Michael, Duran Duran and Phil Collins.
It was organised by Geldof after he saw news footage of the starving in Ethiopia, and sold more than 3.5 million copies in the UK alone.
Sold on CD for £3.99 and also available as a download, the new version is hot favourite to be Christmas number one in the UK this year.
Retailers expect to sell about 500,000 copies in its first week.
Woolworths and Virgin Megastores will give their proceeds to the Band Aid Trust charity, while Chancellor Gordon Brown has decided not to charge VAT.
Band Aid 20 - Who sings what
Chris Martin (Coldplay) - It's Christmas time, there's no need to be afraid. At Christmas time, we let in light and we banish shade
Dido - And in our world of plenty we can spread a smile of joy. Throw your arms around the world at Christmas time.
Robbie Williams - But say a prayer, Pray for the other ones. At Christmas time it's hard, but when you're having fun.
Sugababes - There's a world outside your window, and it's a world of dread and fear.
Fran Healy (Travis) - Where the only water flowing
Fran Healy and the Sugababes - Is the bitter sting of tears
Fran Healy and Justin Hawkins (The Darkness) - And the Christmas bells that ring there are the clanging chimes of doom
Bono - Well tonight thank God it's them instead of you
Will Young and Jamelia - And there won't be snow in Africa this Christmas time
Ms Dynamite and Beverly Knight - (Oooh) Where nothing ever grows, no rain nor rivers flow
Group of 10 and Joss Stone - Do they know it's Christmas time at all?
Tom Chaplin (Keane) - Here's to you
Justin Hawkins - Raise a glass for everyone
Dizzee Rascal - Spare a thought this yuletide for the deprived, if the table was turned would you survive
Busted - Here's to them
Justin Hawkins - Underneath that burning sun
Dizzee Rascal - You ain't gotta feel guilt just selfless, give a little help to the helpless
Joss Stone and Justin Hawkins - Do they know it's Christmas time at all?
Tom Chaplin - Feed the world
Tom Chaplin and Chris Martin - Feed the world
Tom Chaplin, Chris Martin and Sugababes - Feed the world
Everyone - Feed the world, let them know it's Christmas time again (repeated)
Fran Healy - Wooo
Group of 10 - Feed the world
Everyone - Feed the world (repeated to end)
Joss Stone - Ad-libs over outro