This is really cool, it’s a sort of visualization of the weekly top 5 songs from the 1950s to the present. Slide the slide on the right to whatever date you are interested in and listen (and watch!) in awe as you get a snapshot of the US’ taste in music over your lifetime. You really can see how the culture has changed.
(Fair warning: you might spend hours on this; I sure did last night. I think every generation has some gems mixed in with some absolute stinkers.)