It is the intent of this study to describe the harmonic activity that is present in the tone of the alto saxophone and to compare the spectra of selected tones when the chamber of the mouthpiece is changed in size and shape. It is hoped that the following questions might be answered: 1. What does the harmonic spectrum of the alto saxophone contain in terms of harmonic activity and the relative intensities of these harmonics? 2. What basic changes in chamber shape and size have evolved from early models? 3. Is there an appreciable change in the envelope of harmonic activity when the mouthpiece chamber is altered in size and shape? 4. Is it possible for these changes to be used to explain common terminology of the musician in describing tone qualities?