Sonus was built at the facebook london hacakthon. We want to make it very easy for you to discover what people are listening to around you. Whether you want to see what track is popular in Central London, or Manhattan, New York. Sonus will tell you.<p>Sonus' data is gathered by users listening to music on the site. So, if there isn't any data in your area yet, you just don't have users on Sonus just yet.