In the early days of radio, background chatter was created by having actors repeat the word ‘walla’ over and over

In the early days of radio, background chatter was created by having actors repeat the word ‘walla’ over and over

Repeat "walla" out loud for a while. Does it sound like the indistinct murmurs of a crowd? Apparently people think so.

In the early days of radio and television, producers found that having a few people just repeat "walla" in the background created the sound effect of a murmuring crowd.

Today, "walla" is the name for this sound effect and the people making the noise are called a "walla group."

Nowadays though, the walla group will actually speak, often improvising conversations. In the UK, walla is called "rhubarb."

Actors will repeat this word over and over to create the illusion of a conversing crowd. In Japan, the word is "gaya." Consider the different languages and accents, it makes sense that each country would have a different word to mimic the sound of a group of people.

(Source)

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