Soundbending

Soundbending is an advanced form of air bending in which an airbender manipulates the sound waves that travel into the air. One example is in Tales of Ba sing sa when aang was trying to lead the animals out of the city to outside the inner wall, he used his bison whistle to blow into it, sending massive sound waves throughout the city to call all the animals. Besides the show, in the avatar trading card game it has shown many airbenders sound bend.

Sound benders
Malu the Ghost Witch Afiko the Betrayer Avatar Aang