Ed Sheeran successfully defended his copyright court case, what is chord progression and why do so many songs use it?

Question

I watched a video where he demonstrated that many songs use the same tune / Chord progression (?). What is chord progression and why was the one in question essentially uncopyrightable?

In: 531

Answer 1

Why do so many songs use it? Same reason they make the same movie over and over again. People are very simple minded.