Utilizes the Talkie open source library by http://kiln.it. Full Talkie library and documentation here: http://kiln.it/talkie/
Requires using the talkie-leaflet library over here: http://nicholasgunner.com/talkie-leaflet
To see this boilerplate live, visit http://orbitist.com/orbitist-audiomap
Here's an amazing example usage!! - http://www.theguardian.com/world/ng-interactive/2014/aviation-100-years
Music credit: "Sidewalk Chalk" by Broke For Free (http://brokeforfree.com/)