Young Guns has worked with X Factor for the last three years and this year provided a 60-piece choir to support fellow finalist Olly Murs and winner McElderry.
The final was viewed by more than 19 million people.
"Young Guns is all about finding, developing and channeling talented young musicians to perform at the best possible events in the most appropriate environments," said Young Guns director Dominic Lyon. "There is not much of a bigger stage than the X Factor Final."
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