Okay, I'm going to turn into the grumpy old man yelling at kids to get off his lawn today.
This chart lists the most frequently occurring song lyrics by decade in popular songs.
The shift in the past 50-60 years really demonstrates some kind of lost innocence in the US.
From the 1950's when Christmas was the most popular phrase to the current decade where 40% of the most frequently used lyrics are traditional curse words. #SMH at you 'murica.
And what was the obsession with "Old Uncle Casey" songs back in the 1890's ? :)