Schnefsky shows you how to play the Club accordion.
There are so many "Club" accordions available on the market, and they are easy to play. A "Club" accordion is one that has a gleichton button, which is a centered button on the 2nd row that plays the same note on push and draw. The gleichton is sometimes marked with an indented surface or a different color. The gleichton was introduced because it makes the playing of traditional German and Austrian style folk songs much easier because of the typical long musical phrases. Club accordions also usually have a longer bellows than the diatonic, because of these German-style long musical phrases that require much more air that the Celtic or Irish style. ( For example, look at the bellows on a Steirische, they are very large for the same reason, and the air vent is huge to suck in lots of air quickly).
I suggest you learn how to read Griffschrift notation...it's so easy.
The song played is "Jagerlied" from the Michlbauer collection, which I highly recommend.
All Hohner Clubs and most other Club accordions have a shorter inner 3rd row of helper notes. This is not in chromatic order but specific notes were added to help play German folk and pop songs (Schlager). But note that some vintage Club accordions do not have the 3'rd inner row of "helper" buttons, but only have the 2 rows, that is the outer diatonic and the inner gleichton. For example, you can see 2 that I play on Youtube: the Galotta Sport 29 from Germany and the Vicini Rolando from Italy.
The Steirische harmonika is essentially the ultimate version of a "Club" accordion, with 2 to 4 Gleichton rows added to the outer diatonic row.
A very good channel to see for playing pop music on the traditional club accordion is: / heumos1
Good luck, have fun!