I think it has a grasp of revisits, I forget the exact terminology but if you rewatch stuff I tries to predict will you like to watch it again. Some stuff is not worthing multiple times though, once is enough. But music videos can indeed be watched multiple times.

I think I heard somewhere that a lot of kid videos rank in the top stratosphere of view counts on YouTube because kids just play stuff on repeat. There's probably a lot of repeat plays going on across YouTube.