Like her subject, Ms. Bennett has an overbite with a slight lisp and sings with lots of vibrato, especially when nervous.

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His pitch is sufficiently accurate so that he uses vibrato only when he needs to as an effect that can be drawn on for any number of aesthetic reasons.

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One of Mr. Daniels's arias, with its lower tessitura, didn't project, and Ms. Harvey's sometimes excessive vibrato seemed calculated to reach the back of the hall, no matter what.

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Combine that enlightening declaration with some sentimental sweeping strings, the predictable key change mid-way through, plus a lot of vibrato and you have the usual ingredients for a formulaic hit.

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Slim cut his first single, Scufflin, in 1966 and became a Chicago blues fixture in his own right, developing a guitar style that blended a distinct vibrato with a slide-guitar-like sound formed with his bare fingers against the strings.

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