His seminal work, Twenty-Seven Groups of Exercises for Cornet and Trumpet , published originally by Southern Music Company, is the result of his lifetime of teaching.
A key contribution of Irons to trumpet pedagogy was his refinement of the "pivot" system. While later popularized by Donald Reinhardt, Irons utilized subtle vertical shifts in the mouthpiece or horn angle to accommodate the physical changes in the lips as they vibrate at higher frequencies. This allowed students to maintain a consistent aperture and air stream regardless of the register, effectively eliminating the "ceiling" many players hit when reaching for high C and beyond. Influence on the American Band Movement earl d irons trumpet pdf