 He became famous as an interpreter of the music of Johann Sebastian Bach and performed frequently with the Zürcher Bach Chor.He was particularly active in Prague during the 1960s and 1970s where he worked frequently with the Prague Symphony Orchestra (PSO) and Ars Rediviva.With the PSO, he made recordings of the "Johannes Passion" and the "St Matthew Passion" under conductor Jindřich Rohan.