You know how there are some roads where they put in a series of grooved pavement sections to get you to wake up or slow down (because, say, there's a toll booth ahead) as you're driving?  When your car goes over them, it kind of makes a series of tones.

Someone got the bright idea to adjust the height and spacing of the paved grooves so that the road emits a song.

There are a few dozen "singing roads" in the world.  Here's one that purports to play the William Tell Overture:

Not very impressive, but still…. a good use for stimulus spending.