Speaking of Vocal Vibrato : Timbre Perceptions and Semantic Descriptions with Pedagogical and Clinical Implications

This study examined how trained musicians describe vibrato through secondary analysis of interviews in which participants (N = 30, 15 vocalists, 15 instrumentalists) responded to excerpts performed by 12 professional singers across Opera, Musical Theatre, and Jazz genres. Vibrato was mentioned in 5.7% of all comments, with 94% of participants addressing it at least once, demonstrating high perceptual salience. Thematic analysis revealed that listeners focus primarily on variability, tension, and temporal patterns. Approximately 43% of vibrato mentions were related to time-varying characteristics, with half explicitly connecting variability to vocal function and production mechanisms. No significant differences emerged between vocalist and instrumentalist listeners, though vocalists provided more technical commentary. Musical Theatre and Jazz recordings elicited more variability comments than Opera, but singer-specific characteristics accounted for 50% of variance, outweighing genre effects. Acoustic analysis aligns with perceptual assessments, and listeners frequently used crossmodal language (visual, tactile metaphors). Several participants connected irregular vibrato to potential voice disorders, including Muscle Tension Dysphonia. Findings establish vibrato as central to vocal timbre assessment with implications for voice pedagogy and clinical evaluation. The acoustic-perceptual correspondence suggests vibrato assessment could serve as a valuable diagnostic and training tool.