The melody of the final movement of Ludwig van Beethoven’s final symphony, Symphony No. 9, is often associated with the English text “Joyful, Joyful We Adore Thee” written by Henry van Dyke in 1907. Beethoven originally used portions of a poem by Friedrich Schiller (“Ode an die Freude”, first line: “Freude, schöner Götterfunken”). Beethoven’s tune (without Schiller’s words) was adopted as the Anthem of Europe by the Council of Europe in 1972, and subsequently the European Union.
See a list of other popular hymn and chorale themes here.