He completed further vocal studies in Innsbruck, Bologna and finally in Berlin with the well-known contralto Emmi Leisner [de].
In 1937 he made his debut in Eisenach as vox Christi in Bach's St Matthew Passion.
[2] In 1938 he appeared with the Philharmonischer Chor Berlin [de] in Paris in Bach's Christmas Oratorio.
In 1944 Günter was drafted again into the Wehrmacht; until 1948 he was in Soviet captivity after the war where he learned Russian and appeared at concerts.
[2] After the war he resumed his stage career at the Deutsches Theater Göttingen [de] (1949/1950 season).
Günter made a guest appearance at the Berlin State Opera (1944), at the Komische Oper Berlin(1951), at the Oper Frankfurt (1952), at the Vienna State Opera[3] (April 1953; as Figaro in The Barber of Seville and as Papageno in The Magic Flute) and at the Edinburgh Festival (1952 as Papageno; 1956).
He taught at various universities in the United States, Tokyo, France, Great Britain, Sweden, and Finland.
Günter rarely sang dramatic roles, recognizing the natural limits of his voice.