Racetrack Soundtrack Goes From A Roar To A Purr

This year's Formula One cars are hybrids, so their engines are much quieter. One official with Australia's Grand Prix says the engines are "like harpsichords in a chamber orchestra."

Source: http://www.npr.org/2014/03/19/291312013/racetrack-soundtrack-goes-from-a-roar-to-a-purr?ft=1&f=1055

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