Same set of Four Chords Used on Scores of Hit Songs

.... as one commenter on youtube shared: The chords played are, as noted, E B, C# minor, and A, but those aren't the actual keys of some of these songs. What's important is the relativity - it's the 1, the 4, the 5, and the 6 minor. So, for example, in C, it would be C, F, G, and A minor