Animating An Avatars Mouth

I have noticed on some music videos that the avatars are moving their mouths. Can anyone tell me how i can achieve this. As a performing artist I have searched high and low to find out how those avatars managed to have their mouths move while they sing. Any help on this would be greatly appreciated. I have little knowlege about animation and scripting.

Give thanx blessed love and happy sl'ing

Using scripts to trigger some of the expression default animations.
http://wiki.secondlife.com/wiki/Internal_Animations

They might not even go as far as scripting. There are face expression huds out there. There's one at Yadni's junkyard I believe. And you just click on the buttons to make difference expressions on your face. I suppose you could have someone filming you while you are using one of these.

I have a microphone for sale with a singing animation built in, including mouth movement. As Storm said, the principle is basically to use script to trigger facial expressions.

Many thanx Johan, i have visited and bought the microphone blessed love

Greetings johan ...is it possible for you to sell the mouth movement without the mic.....i like the animation but i am unable to utilise my mic dance animations etc with your mic?
blessed love

Y'know, I get asked that enough that I think I'll just include two versions in the box, with and without the mic. IM me in-world about it and I'll send you the new version after I make it.