Jenkins will sing the track while Klass plays piano when they head into a London recording studio on 9 October (14). Also featuring on the song will British opera star Alfie Boe, Welsh singer Aled Jones, and soprano Laura Wright.
Jenkins says, "I have always been passionate about music. I am honoured to be able to use my passion to help others and raise money for Global's Make Some Noise."
Money raised from the record will go to Global's Make Some Noise, a charity initiative to unite radio stations around the world to improve the lives of disadvantage children.