38 Major Pop Songs Played with the Exact Same Four Chords: Watch a Captivating Medley Performed by the Axis of Awesome | Open Culture

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http://www.openculture.com/2020/01/38-major-pop-songs-played-with-the-exact-same-four-chords.html

The 4 chords are I, IV, V, and vi. Wiki says (https://en.wikipedia.org/wiki/The_Axis_of_Awesome) they are played in a I-V-vi-IV order (https://en.wikipedia.org/wiki/I%E2%80%93V%E2%80%93vi%E2%80%93IV_progression).