An infographic showing my iTunes Library. Each song’s position along the x-axis depends on the length of the song; short songs on the left, long songs on the right. The vertical position is determined using the playcount of the song; the more I’ve listened to it, the higher it’s placed. Also, songs from the same album are connected using colored lines.
This way you get an image of your music-listening habits; you can easily pick out the songs you really like and the songs you hardly ever listen to disappear in a big black stain. It quickly tells you if the owner of the library has a broad music taste, or only listens to the same things over and over.