In the title part of Wozzeck, Hans Gröning was an emotionally gripping actor; he sang with a powerful and equally expressive baritone.
Hans Gröning as Wolfram: beautiful, with eminent qualities of a Lied singer.
Bernd Stapka, Göttinger Tageblatt
Hans Gröning as Ollendorf delivers a showpiece of the finest. His magnificent baritone raised the roof of the venerable Prinzregententheater of Munich.
Silvia E. Loske, Musical Reviews
Gröning attracts thunderous applause with his truly breathtaking and superbly mastered cavatine of Rossini´s Figaro.
Birgit Hendrich, Leipziger Volkszeitung
Outstanding: Hans Gröning as Director Hummel.
Florian Zeuner, fm5.at
… strong-voiced Hans Gröning as ruthless speculator and assassin.
Karlheinz Roschitz, Kronen Zeitung Wien
The evening belonged to the expressive baritone Hans Gröning as Lindorff, Coppelius, Doctor Miracle and Dappertutto; his acting and vocal portrayals are truly Mephistophelian.
Dieter Schnabel, Stuttgarter Zeitung
… first and foremost the vocally outstanding and impressive acting of Hans Gröning as Kaspar. (Werner Egk, “The Magic Violin”)
Karin Coper, Orpheus
Hans Gröning is van Gogh. He brings a full and flexible baritone (with absolute text comprehensibility!) to Frid’s expressive intentions. His physical intensity and perfect acting are present every second of the evening.
Wolfgang Wicht, Thüringer Allgemeine Zeitung
Hans Gröning, who possesses a magnificently melodious, sonorous and Italianate baritone, sang with great elegance and distinction.
Ludwig Steinbach, Der Opernfreund
Hans Gröning was utterly convincing in as Morruccio, bringing a wonderful timbre and intelligent acting to the part.
Tobias Kade, Das Opernglas