[1][2] Meeting important chamber musicians there, later singing in choral concerts in Eberbach Abbey in the early 1970s, inspired the idea of a music festival in the Rheingau, using the many culturally interesting venues of the area.

[2][3] He met Christoph Eschenbach, Justus Frantz, Jürgen Ponto, Helmut Schmidt, Will Quadflieg and Leonard Bernstein.

[1] He founded the Rheingau Musik Festival in 1987, with a first season in the summer 1988 of 19 concerts,[2] together with Tatiana von Metternich, Walter Fink, Claus Wisser and others.

[4] He had been advised by Walter Wallmann, then minister-president of Hesse, to better avoid the busy Rhein Main area and begin a festival in the Rhön where it would be supported by Zonenrandförderung [de].

Since 1992 the festival has been run by a GmbH (company with limited liability), with Herrmann as partner and managing director (Gesellschafter und Geschäftsführer).

"Treffpunkt Jugend" (meeting point youth) presents soloists still in their teens in two marathon concerts of chamber music and concertos with orchestra.

On this occasion, Herrmann asked for an exceptional collection to benefit his guest of honor, bishop Ambroise of the diocese of Maradi in Niger.

[14] He gave Andreas Scholl, born in the Rheingau, the opportunity to perform with friends and his sister Elisabeth in several of the area's historic churches on one day.

The first concert on his 75th birthday was played by the Bamberger Symphoniker, a program of late Mozart symphonies, in G minor and C major, and Mendelssohn's Violin Concerto.