
It doesn’t happen too often, but once in a blue moon a hideous chart contains such a novel conceit that we have to post it. For example: This phenomenal little animated gif of music industry sales over the last 30 years.
The series of pie charts shows the sales of various music formats: Thus, you can see cassettes begin devouring the LP, and then CDs devouring cassettes, and then, of course, downloadable MP3s decimating CD sales:

[Via Digital Music News; Top image by Nina Matthews]