Thiecke, William A. - The Art of Trumpet Playing

From the Preface “Students, it seems, invariably do not understand the principles of warming up correctly nor practicing wisely. It is largely a case of “Ve get too late schmart”. By this I mean that we spend an awful lot of energy playing rambunctiously and while this ebullient spirit is a good thing to have, we could direct it to better use. Instead of literally spraying the area with 10,000 notes, we should and could be ahead of the game by practicing a careful series of passages such as outlined by Thiecke.”