Give me some “new” original songs that sound like old songs. They don’t actually have to be “new” songs, but they should be original songs, not covers, that sound like they belong in an earlier era than the one in which they were released. Any style, be it rock, pop, R&B, country, whatever.
I think the obvious one is Uptown Funk. When I first started hearing it everywhere I initially though it was an '80s song that had suddenly become popular for some reason.
Watching the video, it looks like the '80s feel extends to the video as well, with a 1980s era Lincoln Town Car prominently featured.
Queen’s Crazy Little Thing Called Love was written in 1979 but since is was written as a tribute to Elvis Presley, it sounds like it could have been written 20 years earlier.
Caroline Polachek’s “So Hot You’re Hurting My Feelings” (2019) sounds very 80’s owing largely to its Juno-60 synth. Polachek said:
And, man, I tried so hard to make this song feel less '80s, and it just refused. Every time we’d swap out the drum palette with something less old-school, it just lost the vibe. So we just had to admit it. Let it be who it wanted to be.