 The earliest accordions were the typically one- or two-row diatonic button accordions, which carried on in Switzerland as the "Langnauerli", named for Langnau in canton Bern.The Langnauerli usually has one treble row of buttons and two bass/chord buttons on the left hand end, much like the accordion used in Cajun music (minus the stops), but is sometimes seen with 2 or 3 rows on a stepped keyboard.The Schwyzerörgeli was a further development from the 1880s, with changes in the treble fingering and a flat keyboard (not stepped), and unisonoric basses.