The first known musical road, the Asphaltophone, was created in October 1995 in Denmark, by Steen Krarup Jensen and Jakob Freud-Magnus, two Danish artists. The Asphaltophone is made from a series of raised pavement markers, similar to Botts’ dots, spaced out at intermittent intervals so that as a vehicle drives over the markers, the vibrations caused by the wheels can be heard inside the car.
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