I’ve been talking this week about vibrato, the vibrato that string players use to warm up their sounds, and the vocal vibrato that’s the natural product of healthy singing. All vibrato consists of small oscillations in pitch, but not all vibrato is a blessing. When a singer’s vibrato is too fast or too narrow to sound pleasing, it’s called a tremolo , Italian for trembling. And when the singer’s vibrato is too slow, or too wide, it’s usually called a “wobble.” Ideally—in both singing and string