Vibrations and how they get to your ears.
Noise for airports is a blog about culture, sound, music, and technology.
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Updated (sometimes) by Nick Seaver.

Nissan sound engineers have announced that the Leaf electric car set for release next year will emit a “beautiful and futuristic” noise similar to the sound of flying cars — or “spinners” — that buzz around 2019 Los Angeles in Ridley Scott’s dystopian thriller based on a Philip K. Dick science fiction novel.
I agree with other thoughts on this I’ve heard:
1. Awesome!
2. Someone is going to hack this and make custom sounds.
3. Maybe it’s just time to get used to cars that are quiet when going slowly.
(via Los Angeles Times)