Some people create music playlists to suit their mood, or the occasion, or their preferred genre. Others, myself included, organize their songs by city. Most of the songs on my city playlists are either ones I first heard when I lived in that city, ones that now remind me of my life in that city, or ones with lyrics explicitly about that city. My "Chicago" playlist, for example, contains the Sufjan Steven's song with the same name and the Andrew Bird song "Pulaski at Night."
Putting together such a list just got a lot easier with this nifty Spotify-based map, called Spotimap, which lets users find a list of relevant songs by clicking a city. Here's how coder/cartographer Javier Arce introduces his map on GitHub (please note the Air, LCD Soundsystem, and The Clash references):