The Schrammel Accordion is a Viennese creation that was a precursor to the modern chromatic button accordion. The treble side is a 3-row B-system or C-system chromatic keyboard, and the bass side is a 12-button bisonoric chord-bass arrangement. Note that the bass buttons travel parallel to the bellows, like the Schwyzerörgeli. It was popular in Viennese chamber music and in Klezmer.
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