The Soundwalk is an “interactive, geo-locative audio tour” where a user with a headphone and smartphone app equipped with GPS can hear sounds as he or she walks around the city.
…when you move around the sounds will appear to be coming from a particular location, and you can discover other sounds as you walk around.
This innovative project was launched  in Hanoi, Vietnam last year. The developers plan  to spread the concept and campaign to other cities.
Imagine, as the number of available Soundwalks develop, instead of “what do I want to listen to today?”, you'll be wondering “where do I want to listen to today?”.