who sang on do they know it's christmas

That's a great question, and the answer is that a group of musicians called Band Aid recorded the song in 1984. The group was made up of many popular British and Irish musicians at the time, including Bob Geldof, Midge Ure, George Michael, and Boy George, among others. They came together to raise awareness and funds for the famine in Ethiopia, and the song became a huge hit, raising over $15 million for the cause.