Richard and Eric look into a fascinating phenomenon: Collective Memory Decay.  Owing much to the work of the Cesar A. Hidalgo and the Collective Learning group at the MIT Media Lab, this concept looks generally (and specifically) into the interaction between culture and memory.  Can we learn something from the way pieces of information are shared and retained by large number of people.  This study resulted in a truly fun and compelling data set entitled the "Pantheon Project: Historical Popularity Index" the guys excitedly explore.  What can we learn about composers and musicians when they are seen side-by-side, regardless of genre or era?

https://www.kaggle.com/mit/pantheon-project
http://nautil.us/issue/68/context/how-well-forget-john-lennon