One of my other favourite haunts on the interweb is FlowingData - http://flowingdata.com - which celebrates good and bad examples of data visualisation for all sorts of stuff. No, wait, it's fascinating. Have a look.

This one rang a bell - an investigation of "why music sounds worse than it did a few decades ago", as discussed on the podcast some time back in the last decade.

http://flowingdata.com/2010/01/05/a-visual-history-of-loudness-in-popula...