It is said that we only remember the best songs from the 1960s and 70s. There was actually a lot of crap then as there is today, we just don't bother to listen to it. I think this was true for classical music form the 18th and 17th centuries. We remember Mozart and Beethoven, who are the classical equivalents of the Beatles and James Brown. Nobody is going to honor the Backstreet Boys in 200 years. I want to hear some of the more ordinary pieces, to know what I could expect if I walked into an 18th century ballroom which had hired musicians to entertain the guests. Is there a repository of recordings of these lesser know pieces? I want to hear the 18th century equivalent of the Backstreet Boys or Nikki Minaj.
We can't really compare these different musical traditions, they are very different in many ways. However, I can mention some things about the past.
Nobody is going to honor the Backstreet Boys in 200 years.
Weird things have happened... Composers and performers have been extremely famous only to become lost in time later. Also, some dark music has become super famous later. We can't predict the future, and our vision of the past also changes. A lot.
I want to hear the 18th century equivalent of the Backstreet Boys or Nikki Minaj.
There's no equivalent. Period.
Anyways, here comes some less known music from the past. I can't tell you it's exactly what you have in mind, only that it's less well known than Mozart or Beethoven (but I am not sure if this music will be obscure to anybody who has spent time studying music).
Keyboard music from the New World. Here's a bunch of unknown 18th century composers from what we now know as the U.S. This is simple music of the kind most people would compose and play. Cheerful catchy tunes to entertain your own family and guests (not for a poor household, obviously). It's sooooo full of the style of the 18th century that I just can't stand it.
Music for public events. Plenty of music was made for public events, it was kind of disposable and meant to be in the background of things. François-André Danican Philidor is better known as a chess player than as a musician...
Zarzuela. Zarzuela is a strange thing. Spanish opera/musical theatre not too far from the period you ask about (but most of the known ones are from the 19th century, I think). I am sure some people manage to find many great things in it, but some of us just can't. Silly soap operas with repetitive dull music. Yes, it was meant as entertainment, it was never meant to be an example of technical skill or anything... It's like a silly summer movie you watch to pass time. Yes, I know it is of cultural importance and what not... I just can't stand it (I think speaking Spanish just makes it worse). There were similar forms of music + theatre in other places, too. Seriously, there were TONS of this. Silly stories plus music...
If you want to get an idea of what (well-doing) people were dancing to, check these:
https://www.youtube.com/watch?v=UcYZGwfqMzY