Hm, I might go for Siren. I think I have a character of a french girl who used to manipulate her voice for three purposes - 
+ Placating an audience (the typical siren song, causing people to draw closer involuntarily)
+ Harming an audience (Some sort of magically amplified scream which causes ear pain, deafness after prolonged exposure, etc etc)
+ Disorentating an audience (It's a tamer version of the power above, but in a different 'type' of sound, and isn't bound to hurt anyone.)

Of course, there are disadvantages such as the fact people have to be able to hear the sound to feel the effects, the idea that if someone muffled the source of the sound it won't be as strong/much easier to resist, sounds can't travel across incredibly long distances, air is usually a requirement, etc etc etc.

EDIT: Found her, she's called Noémie Favreau. I'll work on a bio (and formatting) in a few hours or so, until then is anyone in disagreement with the power?