INTRODUCTION Vibrato is the periodic fluctuation in pitch, amplitude and/or timbre of a musical tone. It is used by singers, string players, and, in some cases, by wind instrumentalists to ornament or color a tone. Vibrato research has focused on the general characteristics of vibrato, such as its form (generally found to be sinusoidal, but mostly trapezoidal according to Horii, 1989b), its per...