The track should be “sufficiently” xenharmonic, occurring in Billboard Hot 100 (as an arbitrary measure of mass popularity—advice me a better one) listings before 2024-01-01. Xenharmony (for the sake of this question) is the usage of musical tunings other than 12edo. Terms what substitutes for differences from 12edo might be stretched so decide at your own risk if I consider the track you think is far from traditional 12edo usage as plain 12edo.

If I find a way to externalize feelings in the future, I could make the notion clearer. What I definitely won’t treat as xen is trolling like “this piece is in 1200edo but uses steps 0—399—708 for a major triad” as this is quite indistinguishable from 12edo major triad if instruments allow slight detuning. So if the sound is quite strange to an untrained ear, this might be it—also, consult what the artist says about the tuning, as it’s common now to describe not only that a piece is xen/microtonal if it is, but also to name tuning(s) or frameworks used.

[2023-01-05 addition:]

I expect the overal harmony be far from diatonic. E. g. I don’t think I’d consider it just to call a song essentially xen if there are just few moments in just one part that are non-12edo (like an ascending major third divided into 3 or 5 equal-ish steps but not 4 or 2 steps like the only possible way in 12edo). I guess I’m aiming more for xen-ness than exactly microtones (or “macrotones” like in Bohlen—Pierce tunings and others), which neccesitates harmonic movement impossible in 12edo. Or that there are microtones galore, all throughout the music. This still makes for a lot of subjectivity in deciding, of course.

And also I’d wish to retcon that the song should be new—for a soft bound not older than 2000. It is unfair to the question as stated, so I’ll not be restrictive to your picks—but FYI it’s just my interest in the new prospects and the future state of affairs.