When you drive in this "melody road in Japan Wakayama and Hokkaido, you will hear a music from the road. According to Gizmo.Com;
"The Melody Road will allow a car passing above it to play a simple tune, which is made audible by ridges on the road's surface. The pitch of the note created is increased by increasing the frequency of the ridges, and the opposite is also true. Jump for more details, and a completely baffling video. The optimum speed for the best sound reproduction is a shockingly slow 28 mph. At that speed, a little noise will be needed to keep the driver/passengers
aliveawake. In that respect, this is a fantastic measure against excessively slow drivers—who wants this crazy whirring going on while they are driving?"
I am attaching YouTube video clip that shows how it works. This is very analog.