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For many people, the "Games Makers" epitomised the spirit of 2012.
Now, those Olympic heroes are making a bid for the Christmas Number One.
Here's Rags Martel.
The Games Maker Choir now hopes to keep singing - and keep the Olympic legacy alive.
The Games Maker Choir was set up by a group of enthusiastic Olympic volunteers during the London Games.
University student Victoria Verbi decided to set up a choir within the Olympic Park - and within two days of putting a notice in the volunteer newsletter, she'd gathered a group of more than 200 singers.
After one brief rehearsal, the choir performed at the bandstand in the Olympic Park.
They were the unsung heroes of the London Olympics - but now the Games Makers are doing the singing themselves.
The Games Maker Choir, made up of volunteers from the Olympics, is releasing a Christmas charity single called "I Wish For You The World."
Proceeds will go to the British Olympic Foundation and British Paralympic Association, to be spent on developing opportunities for aspiring young people to pursue their sporting dreams.
The track features singer-songwriter Alistair Griffin.