"I bet you could tune the designs so the cables could be played like the strings of a harp." This exists: http://www.popularmechanics.com/technology/infrastru

"I bet you could tune the designs so the cables could be played like the strings of a harp." This exists: http://www.popularmechanics.com/technology/infrastructure/a20082/route-66-musical-highway/ http://www.popularmechanics.com/technology/infrastructure/a2... There are a few of them: https://en.wikipedia.org/wiki/Musical_road https://en.wikipedia.org/wiki/Musical_road