"Smile" is a song with music composed by Charlie Chaplin. This music was the theme for the soundtrack of one of Chaplin's movies, "Modern Times" (1936). The music had no lyrics. It was originally written in D minor. John Turner and Geoffrey Parsons added lyrics and a title in 1954. The lyrics are based on lines and themes from the movie. The singer is telling the listener to smile and be optimistic. "Smile" has become a popular song since its original use in Chaplin's movie.