Many people label it as generic radio bait. It is, but it's really good generic radio bait. The kind that needs to be on the radio more. I'm still not tired of it after 2 months of listening = great replay value.
What a fantastic song. Wow. It's apparently about a breakup, but it was sort of a pilar of support for me in a different situation. "And it hurts so bad" = shivers.
Before I reveal #1, I'll share some honorable mentions (ripping off watchmojo.com here).
My big winner is a fantastic song by Lykke Li which IMO is open to different interpretations. The hook is so good at dwelling on your mind, even the pre-chorus does so. Amazing production also by Greg Kurstin (this song is on his "resumé" for his Producer Of The Year nom at the Grammys BTW, at least they recognized it in some way). To wrap it up: this song went through my head and back.
"Only two artists appear multiple times on the list, as lead and/or featured artist. --> JLo & Iggy (both 3 times)
One of my faves is shut out of the list completely." --> Katy