A distinction must be made between vibrato, which is pleasing to the ear and not harmful to the voice, and a warble, which is an ugly created by singers who have developed, if you will, "unhealthy vibrato." A warble will sometimes make a singer's jaw go up and down; vibrato will not. A warble is the classic "bad opera singer" sound; vibrato is heard by singers of nearly every style of music. A warble is wide; vibrato is not.
I'd also like to mention that using Lehmann's book on singing as a guide should be done with caution. Lehmann had her own vocal woes, and her opinions are colored by her time.
Kristina
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