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Justin Bieber - Never Say Never (From The Original Motion Picture) ft. Jaden Smith

Wiki:

According to the Never Say Never Songfacts,this is the official theme song for the 2010 remake of The Karate Kid. The song is performed by Justin and the 11-year-old son of actor Will Smith, Jaden Smith., who stars in the role made famous by Ralph Macchio in the original classic 1984 movie.