Walla

Walla is the indistinct background chatter of a crowd, the wash of voices in a restaurant, party, stadium, or busy street where no single line is meant to be understood. The term comes from groups of background actors literally murmuring to create the texture of many people talking. Sound editors add walla so a populated scene feels alive, since production audio usually captures the main performers against an unnaturally quiet room. It is recorded by a walla group or pulled from libraries, then layered and balanced under the principal dialogue so it establishes a busy environment without competing with the lines the audience must hear. The key is keeping it unintelligible and at the right density: too sparse and the room feels empty, too loud or too clear and it distracts from the scene.