The third edition presents MRI images and data of an elite group of 12 horn players, including Stefan Dohr, Fergus McWilliam, Sarah Willis, Stefan Jezierski (all of the Berlin Philharmonic), Marie-Luise Neunecker, Jeff Nelsen, and others. MRI films confirm that what we do internally, inside the mouth, pharynx, and thoracic cavity is just as important as what we do externally. And, just as there are hallmarks of healthy embouchures that most professional horn players employ, there are many consistent internal movement patterns among the elite group. Epstein presents tried and true methods to learn and teach these exemplary biomechanics.