The closest modern equivalent is a weekly comic book (or manga) that gets turned into a graphic novel after its run.
Other examples of serialized novels include The Count of Monte Cristo, Madame Bovary, Uncle Tom's Cabin, Tolstoy's Anna Karenina, Dostoevsky's The Brothers Karamazov, Joyce's Ulysses, Hemingway's A Farewell to Arms, and Fitzgerald's Tender is the Night. A Farewell to Arms, for example, was completed entirely before it was serialized in Scribner's. In the heyday of the Atlantic and Scribner's magazines, many of the best American writers would first publish their novels in installments prior to releasing as a single volume. It was considered a mark of success to publish in installments in one of the vaunted literary magazines.
We’ve lost most of it, but there were tons of works connected to the Iliad. It’s just the last year of a ten year war. The instigation of the war, events in gathering the allies on both sides, the voyage of the Greeks to Ilium, and other battles and skirmishes are alluded to, but not directly covered in Homer’s story. Then there’s the return of the heroes other than Odysseus! We have some of this in surviving tragedies, but know only titles and maybe topics for a whole bunch more.
Then you’ve got all the national myths that connect to it. The Aeneid, the Round Table and broader “Matter of Britain”, et c.
This is of course true of mythology more generally, not just the Trojan War literary cycle. Mythology was the "fictional universe(s)" of its day, that most cultured people would've been familiar with.
Is this true? It was very popular with the people whose accounts mostly make up primary documents from that period. But they were a tiny minority of the population in absolute terms. The population was still primarily rural-agricultural, did that allow access to opera for most people?
There are several extant folk music traditions with continuity to 19th century italy, it seems much more likely to me that most people's music exposure would have been to locally produced folk styles than opera.
Speaking of Verdi, he postponed rehearsals of the famous "Donna e mobile" aria until the day before premiere, to keep it a secret, because he predicted (correctly) that it was going to be an instant hit. On release, it basically became a pop song, performed all over the place (recording did not exist, remember). This may give an idea what a hit could look / sound like at the time. BTW it has most features of a modern hit song: a clear rhythm, a simple but catchy and recognizable melody, somehow playful words about the nature of romantic relationships.
Of course live music was how people accessed music, and generally for this time in most parts of europe we have a strongly attested art music tradition enjoyed by the aristocratic minority and a separate, vastly more popular yet barely attested folk music tradition associated with the lower class rural majority.
The elite wrote about the things that interested them, and their writings make up the vast majority of primary documents from the era. We have to be careful not to accidentally consume their biases along with their information.
Notably though, there was sheet music as a mass-market form of music, so we can tell what was popular - and "opera tunes" definitely made the list, together with theme-and-variations sets based on opera tunes, medleys of opera tunes, parodies based on the tunes, arrangements for countless instruments etc.
Isn't that mostly just a change in technology? Taylor Swift and Whitney Houston have to sing into microphones that amplify their voice electrically, whereas opera singers obviously don't; they just sing the way public singing was done for much of recorded history. To some extent, the point of opera and classical music (which also features unamplified instruments) is a kind of historical reenactment; of keeping performance practices alive that have a very long history of their own.
It's still a niche product compared to recordings of, say, Taylor Swift (who is also an excellent performer).
[1]: https://thespaces.com/sydney-opera-house-emerges-with-a-whol...
An example : Darren Aronofsky's now-famous cribbing of Satoshi Kon's work, back when anime was mostly thought of as, "Sex and violence, Pokemon, and Miyazaki (if you even knew of Miyazaki)." And even that's kind of the tip of the iceberg. Decades-old expressionist films, little-known performance and video art, paintings, music, fashion; unless you really know the landscape, how can you tell what is and isn't influencing culture down the line? How much of your experience in the world of 2024 was shaped by the proclivities of teenagers on IRC and 4chan in 2004, just trying to make each other laugh?
[Insert that monologue from The Devil Wears Prada]
As J.L.Borges aptly noted, a serious artist produces not only successors but also predecessors. (Regarding Miyazaki, I could not miss an animator who was praised so highly by Kurosawa. I learned about the rest of anime later.)
But my point was more narrow: however beautiful The Magic Flute or Barber of Ceville or even Carmen may be, they are sort of stuck in a particular point of cultural space, you can't materially change them without leaving the genre that defines them. This is not specific to genres that became high-brow "refined art"; you can't play a rock-n-roll like it's 1957 either, it will only resonate among the fans of the genre / period, not very numerous now. With that, both opera and rock-n-roll were once the epitomes of wide, overwhelming popularity, each at their time.
I agree about lineage. This is basically how culture grows and develops. The past is absolutely not worthless, but no cultural epoch is a final destination. Rainbow in 1970s, Jethro Tull in 1990s, and Master Boot Record in 2020s all directly quoted baroque music, but each of them did that differently, and not exactly the way an authentist ensemble would play it.
As an artist, you certainly can change (some of) the world if you do art which people care about. If you do refined academic portraits, or [adjectives expunged] postmodern art, only a bubble is going to care. If you do art like, say, Banksy, a lot more is going to care. If you sing in classical opera, only a narrow (but usually wealthy) circle of opera goers will care. If you sing like Taylor Swift or like Whitney Houston (who had a powerful, opera-worthy voice), you may have a much wider effect.