Par HERING SIGMUND. Hering's etudes are the fruit of his 20 years of teaching experience. Students will develop musicality in the classical style. These are beginning to intermediate level etudes, each one page long, and each introduces a different concept. They also progress in difficulty throughout the book. This slim book is a good companion and for advanced players, will provide handy material for warm-ups and brushing up on technique./ Etude / Trombone