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96-button Stradella bass layout on an accordion. C is in the middle of the root note row. The Stradella Bass System (sometimes called [1] standard bass) is a buttonboard layout equipped on the bass side of many accordions, which uses columns of buttons arranged in a circle of fifths; this places the principal major chords of a key (I, IV and V) in three adjacent columns.
120-button Stradella bass layout chart: Date: 1 October 2008: Source: Own work: Author: Necz0r: ... Accordion/Print Version; Accordion/Left hand; Accordion/Left hand ...
Free bass accordion is taught at the undergraduate and post-graduate levels at the National Autonomous University of Mexico in Mexico City. In the United States, free bass instruments are much less well known despite attempts to popularize them by Palmer and Hughes and the Giulietti Accordion Company [ 17 ] [ 18 ] in the 1960s and 1970s.
The typical Schwyzerörgeli today has 18 bass buttons arranged in two rows (one for bass notes and one for major chords), and 31 treble buttons on the RH arranged in 3 rows with a fingering similar to the 'club' system. The basses progress in 4ths like the Stradella system seen on chromatic and piano accordions, but in the opposite direction.
The rarely used bass accordion has only a right-hand keyboard, with ranks of 8', 16', and 32' reeds, with the lowest note being the deepest pitch on a pipe organ pedal keyboard (pedal C). It is intended for performing basslines in accordion orchestras. The rarely used piccolo accordion also has only a right-hand keyboard.
Bayan; Classification: Free-reed aerophone: Hornbostel–Sachs classification: 412.132: Playing range; Right-hand manual: The Russian bayan and chromatic button accordions have a much greater right-hand range in scientific pitch notation than accordions with a piano keyboard: five octaves, plus a minor third (written range = E2-G7, actual range = E1-C#8).
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The bass-side keyboard is usually the Stradella system or one of the various free-bass systems. Included among chromatic button accordions are the Russian bayan and Schrammel accordion. There can be 3 to 5 rows of vertical treble buttons. In a 5 row chromatic, two additional rows repeat the first 2 rows to facilitate options in fingering.