I get that all the time. They're pointing at my accordion.
"Isn't that supposed to have ... like ... piano keys or something. Is that a concertina?"
|Saltarelle Pastourelle III, a magnificently fine button|
accordion, or melodeon, or accordéon diatonique.
photo by Brigid Chapin
I belong to a fantastic on-line forum, based in England, called Melodeon.net, and there, it seems, any rectangular, free-reed box with buttons and a diatonic push-me-pull-you (bisonorous) action going on is a "melodeon," not an accordion. An accordion would be ... well ... not entirely sure, maybe unisonorous piano keys or buttons. Historically, "melodeon" has been used for button accordions with one row of buttons, like Cajun accordions, but my guess is that, at least in England, the word "melodeon" has gotten legs.
In France it's an accordéon, which is where my nom de blog comes from, though it's a rogue derivation, a figment of caprice. A person who plays accordéon is an accordéonist, properly. Colloquially, though, a person who plays a melodeon is called a diatonist, because the kind of accordéon a melodeon is, is an accordéon diatonique. Which is what l'Accordéonaire plays, though he is a figment of caprice. In America, he plays an accordion of some sort, and it's not a concertina. That's something else.