(Credits: © Yiorgos Mavropoulos / Andreas Weiss) The Herbstgold Festival in Eisenstadt  has announced its 2020 Edition. For the purposes of this article, we will focus only on vocal performances. The festival opens with a concert starring soprano Marlis Petersen, mezzo-soprano Anke Vondung, tenor Werner Güra, and bass Florian Boesch. The program includes Haydn’s Symphony No. 30 in C major {…}