Tubist Josh Budziak won a grant to support research on brass mouthpieces along with Masters student Jack Earnhart. Musicians and manufacturers claim that acoustic and sensory percepts are direct results of mouthpiece geometry. These claims are often anecdotal, and lack support from objective or controlled testing. This research is a quantitative study that examines relationships of mouthpiece mass and spectral components, and will evaluate if observed spectra are the result of the player’s perception and bias of the impact of mouthpiece mass on timbre.