I don't think any song too longer to grow on me than Attention. Even once I charted it, I didn't expect it to go top ten, and then it managed to contend for #1. It might have even been #1 if it hadn't peaked just as I was moving to my Christmas playlist. Part of the bias is that I hadn't liked what Charlie had put out in previous singles - I mean a song only needs so much falsetto, Charlie! But his voice managed to be the thing that drew me in here - especially that money moment where he keeps his voice just shy of cracking during the line "when you were mine", pauses, sighs, and then brings it home for the big finish.
This song is still hanging there in the current Cheap 20 and likely would finish a few ranks higher if his entire chart path were to be included. It is currently at #12.