This is a simple, easy arrangement of Haydn's Emperor's Hymn melody. The hymn is the main melody in the second movement of Haydn's String Quartet No.62 in C Major Op. 76 No. 3. From Wikipedia: "The Quartet No. 62 in C major, Op. 76, No. 3, boasts the nickname Emperor, because in the second movement, Haydn quotes the melody from "Gott erhalte Franz den Kaiser" ("God Save Emperor Francis"), an anthem he wrote for Emperor Francis II. This same melody is known to modern listeners for its later use in the German national anthem, Deutschlandlied. "