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From the Open Geodata Blog:
Check out a unique use for Open Street Map data: music! From the artist's, French Letter, site on Band Camp: "This is Washington, DC and the surrounding highways remapped in audio. It is an east-west sweep of the city, so it begins with the slow creep of the Potomac River heading southeast and then hits the chaos of the city. North-South values are mapped to pitch."
Open Street Map data is freely available for many uses and licensed under a Creative Commons Attribution-ShareAlike 2.0 license.
Also, take a look at a previous Open Street Map post on this blog.