Voice lessons - Vocal Vibrato
Check the simplest way to create an impact while singing. Vibrato can be easily achieved by doing Siren exercises. Vibrato is an effect consisting of a regular, pulsating change of pitch. It is used to add expression to singing. Vibrato is typically characterised in terms of two factors: the amount of pitch variation ("extent of vibrato") and the speed with which the pitch is varied ("rate of vibrato")
This Video will show you basic way to learn Vibrato, without a piano.
Check this video on when to effectively use Vibrato
Another video on same topic, in case it helps.