Its no surprise to anyone that songs have been recycled throughout time, and some riffs or chords are repeated subliminally every so often. These are just the facts of music. I accidentally came across a video featuring a comedic band named ‘The Axis of Awesome’, that proves this point. They actually proved it a little too well… (It was like shooting a mosquito with a cannon). Take a look at the 3 piece band below going through all the songs that use the exact same 4 chords.