Guitar
In its pure form, vibrato is usually achieved by twisting the wrist rapidly to bend the note slightly, moving to and from the root note. However, the same techniques are applied at a slower speed to get pitch alterations.
In contemporary music, finger vibrato is also routinely used by classical guitarists on longer notes, to create an impression of a longer sustain. The technique is also used by jazz bassists to add depth of tone.
Read more about this topic: Finger Vibrato
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“Swiftly in the nights,
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—Wallace Stevens (1879–1955)