I actually don't quite see Happy as being major competition for Dark Horse. I think it'll peak really high but I don't see it overthrowing DH cause it's not really one of those songs that has that extra spark. Sure its good on the first couple listens but to me, after seeing the beats commercial being played every 5 minutes, every single day, I'm tired of it already

so I don't think it'll be that big of a threat but I could be wrong