Insist On a Genuine Bach Mouthpiece Bach mouthpieces are designed to meet every conceivable playing need and have for nearly three quarters of a century. A Bach mouthpiece will make a poor instrument play well, a good instrument play better. Volume and excellent intonation, ease of response in the high and low register, rich, uniform timbre throughout the range, and resistance calculated to increase the player's endurance—these characteristics explain why professional artists choose Bach. Because Bach mouthpieces are an accepted standard of quality, their numbers are familiar everywhere as designations for certain models and types. Only genuine Bach mouthpieces bear the full inscription VINCENT BACH with one of the model numbers.