[dfan]

Agreed, this is definitely not surprising. In fact, one of the biggest broad distinctions between the harmonic rules of classical music and pop music is that classical music tends to use authentic cadences (V -> I) and pop music tends to use plagal cadences (IV -> I). (If you're curious, in jazz the cadence you see all the time is ii7 -> V7 -> I7.) Of course I am speaking in large generalities; there are millions of exceptions.

The canonical classical music harmonic progression is I -> IV -> V -> I, whereas that famous four-chord sequence that underlies hundreds of pop hits pretty much runs the same sequence in reverse: I -> V (-> vi) -> IV -> I.