He went on to conduct the choirs of the Wiener Singverein, the Vienna State Opera and the WDR Rundfunkchor Köln.
As a close collaborator of Herbert von Karajan from 1989, he prepared choirs for the Salzburg Festival among others.
Born in Vienna, Froschauer received his musical education with the Wiener Sängerknaben boys' choir.
[2] As a close collaborator of Herbert von Karajan from 1989,[4] he was involved in the preparation of numerous concerts, recordings, and television recordings at Salzburg Festival, Berliner Festwochen, and Wiener Festwochen.
[5] For many years, Froschauer and two other colleagues have also conducted the Sunday masses in the Vienna Hofburgkapelle [de], in which the Wiener Sängerknaben also took part.