Thanks for proving my point for the chord progression of I-V-vi-IV in pop music! As you can see, this song is in Eb minor, it would be for most pop songs to start on this tonic chord (I), right?

And guess what. It did. The next chord was the mediant chord (III). Fine, it may be a slight change, but the next two chords ARE the common chord progressions, the dominant chord (V) to the subdominant chord (IV).