Andy Woodruff noticed that Ohio has 88 counties, the same number as keys on a piano. So he went to work on a map application that assigns a note to each county. You can play a song on the map (a couple of songs are plotted out for you) or reassign the notes based on census data such as population, number of rental houses, or median age. You can even hear what a route from one place to another sounds like!

Link to map. Link to the story behind it. -via the Presurfer