players who use the Vienna horn also use a natural horn mouthpiece, which is less concave than a typical double horn mouthpiece. A standard horn mouthpiece is more concave, partly to facilitate the playing of lower notes because of lower impedance of the double horn. References External links Gregor Widholm: The Vienna Horn - a historic relict successfully used by top orchestras of the 21. century Thomas Jöbstl: The Vienna Horn Viennahorns chamber music ensemble Scottish Vienna Horns F instruments Horns