Using Audacity, I created 60 tones. Each tone represents a city. The first 30 tones are cities that I've been to already, the last 30 are cities I'd like to see. Each tone has a frequency which has been calculated by adding the latitude and longitude degrees of that particular city.
![[help]](/images/question.gif "[help]")
)![[Attribution]](http://creativecommons.org/images/public/somerights20.gif "[Attribution]")