This research implies a service application providing pedestrians of modern cities with the audio approach. The mobile audio service Barsonar enhances the night-time strolling in alleys, lanes, or backstreets; in other words bar-hopping or pub-crawling. The pedestrians can search for a bar/pub in nocturnal cities as if using a fish-sonar on a boat out in the sea fishing, and decide on the direction to head and the destination to drink out. Barsonar provides a real-time bustle map along with an aural navigation through your mobile. This paper presents an initial paper prototype that investigates the customer journey the service shall provide, and also indicates potentials for how an aural flaneur experience and the soundscape for metropolitan cities that can act as third places shall be in the era of drastic change.