Online music streaming sites like Spotify and song recognition services such as Shazam are revealing unprecedented amounts of data regarding music listeners' tastes and habits to radio stations and record companies, and Derek Thompson at "The Atlantic" takes a fascinating look at how these technological developments are changing hit prediction - and possibly the future of music itself - in his article "The Shazam Effect." In fact, most of these online services offer "free research" on current music from all over the globe via charts on their websites, and we've collected links to them all (Shazam, Spotify, YouTube, etc.) here in one place: Music Charts From Around The World