You're the Best was written by Bill Conti and Allee Willis and performed by Joe Esposito. The song was originally intended for Rocky III before Eye of the Tiger was chosen instead, then found its home in The Karate Kid in 1984 during the tournament montage. Its sincere, high energy chorus made it a lasting shorthand for underdog triumph. Decades later the key line circulates as a short soundboard clip, shared whenever someone online wants instant eighties motivation or an ironic celebration of a very small achievement.