“His work as an interpreter was so original and so powerful that it has influenced musicians down to our own day: generations of conductors, including those who disagreed and disagree with his interpretations, have been the beneficiaries of his reforms in the opera house and concert hall, and his insistence that the performer’s job is to come as close as possible to revealing the composer’s intentions, rather than to use the music as a vehicle for self-expression, remains a basic principle for many of today’s outstanding performers.”