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Brochastic Guyolence mastodon (AP)
I think a good artificial noise for electric cars to generate, so they are audible enough for pedestrians and others to be aware of them nearby, would be the synths from Darude's Sandstorm.
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Pippin friendica

Personally, I feel the only acceptable artificial noise for a car to produce is this:

JETSONS_SPACE_CAPSULE_LAND_AND_STOP_01.ogg

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