[LouieFisk]

Fun video, though I’ve never seen an accordion that looks like that before!

[Salvey]

Looks like a bandoneon, used in tango orchestras.

[ROCKLOBSTER]

I’ve never seen an accordion that looks like that before!

That's a button accordion.

[Right Wing Assault]

Isn't that a concertina?

[Albion Wilde]

I’ve never seen an accordion that looks like that before!

That instrument is actually called a concertina. You might have seen them in movies about Italy or Italian immigrants to the New World at the turn of the last century. But if the makers of the video had used the word "concertina" in the title, very few people would have understood.