Vibrato
Quick Definition
A natural oscillation in pitch, intensity, and timbre that occurs in a freely produced singing voice, typically cycling 5-8 times per second.
Factual Definition
Vibrato is a periodic modulation of frequency (pitch), amplitude (loudness), and spectral content (timbre) in the singing voice, resulting from the balanced interplay of intrinsic and extrinsic laryngeal muscles when the voice is produced without excess tension.
Full Explanation
Vibrato is the natural oscillation heard in a freely produced singing voice, characterized by regular fluctuations in pitch (typically ±1 semitone), loudness, and timbre. A healthy vibrato typically oscillates between 5-8 times per second, though this varies somewhat by style and individual.
Rather than being something singers consciously add to their sound, vibrato emerges naturally when the voice is well-supported and free from excess tension. Its presence often indicates healthy vocal production, while its absence (straight tone) or irregularity (wobble, tremolo) can signal tension, fatigue, or technical issues.
Different genres have different aesthetic preferences regarding vibrato. Classical singing typically features prominent vibrato throughout sustained tones, while some contemporary styles prefer straighter tone with vibrato used selectively. The ability to vary vibrato intentionally—more, less, delayed onset—is a mark of advanced vocal control.