01:45, 6 April 2007Matthias.A.Bertschtalkcontribs uploaded
File:Gregor.jpg(Assistent Gregor in his Singerstraße Institute. Historic Vienna Builing. Institute of Music Acoustics, Institut für Wiener Klangstil, University of Music Vienna. Picture made by Prof. Dr. Matthias von Herzberg, in early times ... years ago)