So far I think “Uptown Funk”, “Blinding Lights”, and “Old Town Road”. That doesn’t mean I love those songs. It means I think they answer the question. I know you may love “Irony x3” by Zigbones. But they ain’t it.
Edit: I’m sorry for the poorly worded question. I think it’s autism related, but I don’t see possibilities or alternative understandings easily, and when I wrote “decade” I thought 10 years and that was it.
Of course anyone answering from the perspective of 2010-2020 was making a perfectly reasonable and rational answer and I was very dismissive. I’m really sorry for that.
I remember an article that used (Spotify?) play trends to project this, and at the time they thought Pompeii by Bastille would be the one with longevity, while a few other hit songs by big names would be forgotten. I can’t find it now.
IIRC the basic idea was that genuinely memorable songs peak less hard and only fade very slowly, while trendy songs crash as everyone moves on to the next shiny thing marketers put out.