About this method, Chris Gekker writes:

David Bertie’s Trumpet Harmonics is a remarkably focused study of flexibility as applied to brass playing. His concise yet comprehensive exploration is unique in several ways.

Firstly, his attention to the role of the tongue in flexibility work, in terms of mobility and utilizing articulation work as part of this practice. This topic has been examined in the past by authorities such as Claude Gordon, and it is gratifying to see it highlighted here. I...