Just based on my knowledge of music, math and physics, I’d say that your speed would have to be pretty close to the speed the grooves were designed for in order for the music to play in a recognizable format. Too fast and you’d miss notes (tires skipping over grooves) and have deformed notes (too many vibrations traveling too close together.) Too slow and you might not generate a fast enough wave to carry the melody either.
The article does mention the roads were designed for 55 mph. That leads me to believe there is a finite range of speeds that the road would function for.
As for tiring of the music, one would think it would be something you would not drive over on a daily basis. Dunno. That’s why I mentioned it would really suck to live by the street built like that and you’d probably want to put it in a touristy place like near a boardwalk, pier or famous gathering place where merchants can fleece the tourists.
