The Pentatonic Scale thread reminded me of this video, so I thought I would share it.
Of course, I don't know a single one of those songs myself.
4 chords is all ou need for every pop song ever made
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Ahh~ I remember this.
I saw this in my music lesson quite a while ago. To this day I still believe that these guys are geniuses! 
Noice video to share, I'm sure others will find this interesting!