Some quick examples:
There was a man from my city who made me (and millions of people more) like the accordion. He was called "El Rebelde del Acordeón" ("The Rebel of Accordion"). There are no people who won't think of him when the accordion is mentioned in Mexico. Here are some videos
I played accordion as a teenager. I doubt that many of my peers would have deemed the sound (even expertly played on an exquisite accordion) as "beautiful". It was more of something to be mocked.
For that matter, as an adult, my peers still tend to mock accordions.
What a difference being a single country away makes!
Does it sound like that when I play? Absolutely not, but I can dream.
For a while I played bass in a Gypsy jazz group which included an accordion player.
I had no idea accordions had any stigmas until moving away.
Here's another one: "al pastor" meat was brought to Mexico by immigrants from Lebanon, as an adaptation of shawarma with local spices.
I am unsure what a Bandonion does. Wheatstone concertina (yes, the guy who made the wheatstone bridge I believe) are also same note push-pull. More buttons. more. Wheatstone concertina sell for $10,000 or more. Melodions sell for $100
Zydeco typically uses the harmonica-aligned melodion. Bandonion music is what Astor Piazzola plays.
(can play a melodion. cannot play piano accordion or concertina)
Jimmy Shand is god. Just saying.
One confusion is that the word “melodeon” is used more in the UK, Ireland, and Australia (according to Wikipedia) and “diatonic accordion” in the US, but they’re words often used for the same thing, I think?
Harmonicas have free reeds and so do accordions and concertinas, but they don’t use the same parts as someone might guess from the way you said it. Harmonicas (and melodicas) have many reeds cut out of a single metal plate. (Or plastic for some harmonicas.) Accordions typically have pairs of reeds (one push and the other pull) held into a wooden reed block by wax, so they can be individually removed by melting the wax. Some less expensive concertinas use accordion reeds and the crazy-expensive ones use hand-made concertina reeds.
Also, a piano accordion or chromatic button accordion could be tuned to play some notes differently on push versus pull. (For example “Arabic tuning.”) This is rare, though.
A fundamental reason to have different notes on push versus pull is to use fewer reeds, saving weight and complexity, which is more important on smaller instruments. But this resulted in different music and playing styles too so they’re also culturally different.
The lead was playing an accordian for a heavy metal band at a local bar in Лесковац (Leskovac, Serbia), and I had a fantastic night there. Great people - rough but really friendly in my limited experience.
Personally I mostly hate the accordion, and too much time around any folk music drives me up the wall, but occasionally it is really beautiful.
The weirdest thing though, was I remember in college coming across Bohemia beer at the local liquor superstore. I thought it was strange that the bottle had a Native American on the label, but I didn't think too much of it when I bought a bottle. It was only when I got back to the dorm and looked closer that I discovered that despite the name, it was actually a Mexican beer.