There he was greatly influenced by Walter Engel, who taught him the piano (Kodaly method), composition and violin. From 1946–1948 he studied at the music conservatory ... Derr has done a superb job of ...

In addition, he wrote essays on Debussy, Grieg, Liszt, Mendelssohn and questions concerning general editing, as well as giving seminars on editorial practice for musicology students in Munich. Man ...