Brass Band set including full score. The Post Horn part is provided in Ab, however a Bb trumpet part is also included in the set for greater flexiblity. In 1844, the German cornet player Hermann Koenig wrote Post Horn Gallop for Post Horn with orchestra accompaniment. Its great popularity meant that it has made its way into the brass and wind band repertoires. Ed Keeley has given it a festive twist by including motifs of Jingle Bells, Good King Wenceslas and Here We Come A-Wassailing.