I was surfing around YouTube when the title of this piece caught my eye…turns out it’s beautifully played on a Bayan chromatic accordion. I’m not too knowledgeable about chromatic button accordions but I think that Bayans are what they call B system or B griff, as opposed to C system, the other alternative. I think the two systems are related – one is somehow arranged the opposite of the other. I don’t know really what that means to a player, except that I can’t imagine anybody learning both systems.
One of these days when I win a small lottery, I’m going to get myself a nice chromatic button accordion (perhaps not a full-sized one like this…I’m thinking maybe a 96 bass accordion) and take on the project of learning the fingering.
27th Street 
Hi,
I’ve been searching for the score of this waltz all over the world.
Would it be impolite to ask you if you could send it me?
Thanks in advance,
Frederik.
I don’t have the score.
I don’t know anything about accordions (obviously), but from a purely esthetic point of view, I love the looks of that one. The buttons are beautiful.
I think the idea is that the buttons are arranged so that the fingering pattern stays constant from key to key, more like a fret-board than like a piano keyboard. Good players can play these instruments very fast because it’s easier to reach all the notes you need with minimal cross-overs.