Ulrich Beetz, Birgit Erichson and Gerrit Zitterbart, the three musicians of the Abegg Trio, are a faithful threesome: they have been playing together for thirty years and the constant motto of the ensemble has remained unchanged: authentic reproduction of musical works. This concept of "authenticity" has altered a little in the course of the years. In recent years the three musicians have become more ambitious in their choice of instruments. For example, Gerrit Zitterbart only plays on pianos which are from the time of the composition, here a pianoforte built in 1864 by Johann Baptist Streicher in Vienna. Ulrich Beetz and Birgit Erichson use gut strings for their instruments; and Stephan Katte blows Brahms' Horn Trio on a natural horn - just as Brahms expressly requested.