Called All It Takes Is Love, it is a song about what it is like to be a refugee.
Mr Coleman said: "I wrote the song because there are lots of charity songs that say what they are going to change.
"You hear Band Aid and it is 'we want to do this. We should do that'.
"I decided to write a song that would be through the eyes of a refugee.
"I knew that I don't know what it is like to be a refugee, but I wanted to try and imagine it. Two people from the UN got in contact with me and said they liked the track and wanted me to take part in the concert.
"I'm really excited by it. "To get on the stage in front of all those people and with all these great singers on stage is just a great opportunity for me."
The concert is designed to raise awareness and vital funding for the more than 1.8m people affected by the continuing crisis in Darfur, Sudan.
The situation in the strife-torn region remains extremely volatile. More than 200,000 Sudanese have fled to neighbouring Chad and 1.6m people, who have been displaced internally, are now living in desperate conditions inside Darfur where there has been a
complete breakdown in security. This is one of the world's worst humanitarian crises and urgently needed proceeds from the concert will be used to provide international protection and life-saving assistance to those affected.
