Well, to address your concern about why we need the source, before you provided the ad, I thought it was a play on words. Pleats almost sounds like beats and music certainly has beats.
However, now that we have the source, we notice that there is sharply dress man (the one who asks "Four pleats?") and the other guy. Instead of telling the other guy that his sense of style is poor, he takes him to car, plays the first track and asks, "How many pleats does this song have?" In other words
How many pleats are these guys wearing?
None. He plays the next song and asks about their pleats. In other words
How many pleats are these people wearing?
The song is "It's a Sunshine Day" performed by The Brady bunch
![enter image description here](https://i.stack.imgur.com/Du4hB.jpg)
How many pleats did they wear? (Presumably the men.) Four.
Hence, the sharply dressed man is implying that the other guy's sense of style is out of date. By association, we understand that the car being promoted is cool and sleek, like the sharply dressed man, by today's standards.
By the way, the 4/4 thing is called a time signature.
Best Answer
The standard usage for 4-year schools in the United States (either high school or undergraduate university) is
As far as I know, these are not in general usage in other English-speaking countries. And there are a few universities in the United States that do not use these terms, usually for historic or traditional reasons.