I recently came across a CD of the soundtrack to That Thing You Do!, a movie I didn't see when it came out in 1996 or now. I vaguely recall having seen previews for it, and thinking, "oh, another cute Tom Hanks movie." (Is it at all interesting that looking at the release date, it came out the weekend before I met Dr. Fledermaus? Two weeks later and it could have been our first date!)
The premise of the movie is that it's about a (fictional) US rock band in 1964--the rise and fall of a one-hit wonder. And, of course, there's a bunch of music--the title track, of course, is the one hit.
Now, this is where it gets interesting: By vague recollection (again), I think that the music, when it was made, wasn't a bad facsimile of pre-British-Invasion pop, but now, my God! it is straight out of 1995 and couldn't possibly have been made any other time. Not that it's bad, it's just 1995 pop through and through, with a bit of a nod to the early sixties.
Stylistic dating. It works. (Whoa, wait, that sounds like an internet dating service ad.)