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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.
The "quint" free-bass system invented by Willard Palmer – later patented by Titano, has extra bass rows to extend the existing bass arrangement of the Stradella system. [6] The quint version and chromatic-button versions were available in "converter" (or "transformer") models with a control to switch from standard Stradella to free-bass. [7]
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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.
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).
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.
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How many reeds an accordion has is specified by the number of treble ranks and bass ranks. For example, a 4/5 accordion has four reeds on the treble side and five on the bass side. A 3/4 accordion has three reeds on the treble sides and four on the bass side. Reed ranks are classified by either organ 'foot-length' stops or instrument names ...