NOTE: Some older style Chromatic accordions have rows of square keys arranged in a "stair-step" pattern instead of having round buttons.ĭiatonic accordions have button keyboards and the newer ones often have a rounded streamlined look. The rows of either system are usually repeated forming 4 to 6 rows, so the player can play an any key (transposing) using the exact same "fingering" pattern, which of course would be impossible in the irregular pattern of five black and seven white keys of the piano-style keyboard. The "B System" or "B-Griff" has the B row on the outer edge and then the C row and the G row. With the "C row" on the outer edge of the keyboard, then the "B row", and then the "G Row" it is called the "C System" or "C-Griff". There are two possible arrangements of these rows of keys, called the C system and the B system. repeated at intervals of an augmented second the B row is D, F, G#, B etc. "accordion school" boom period of the 1960's and 1970's.Īside from the rare "Checkerboard" chromatic accordion described below, most chromatic accordions divide the twelve-tone chromatic scale into three rows of buttons or keys. Smaller 41 key 120 bass accordions were made to weigh less and many of those quite small were made for children during the U.S. The standardized full-size 41 key keyboard measure 19-1/4 inches from thje outer edge of the F key to the outer edge of the A key. The treble keyboard that goes with the 120 bass accordion is usually 41 keys ranging from F to A including 24 white and 17 black keys, which might actually be whatever color the manufacturers felt would be attractive.
If the 120 bass has an extra row it would be either next to the bellows, minor third basses, or an extra outer row augmented dominant chords, like C E G# (rare) and there are even rarer, 160 basses.
would be a subset of 120 basses with the C row somewhere in the middle. This is often a grid of 6 X 20 buttons, 120 bass. Then the third row from the bellows will be the Major chord, then the Minor chord, then the dominant seventh, resolving into the subdominant, like C E G Bb with often the fifth (G) removed resolving to the F major or Minor, and the last outer row the Diminished chord with usually only 3 notes, e.g., A C Eb. Usually those tonic bass notes will be in the second row outwards from the bellows, with the major third next to the bellows. The most common bass note arrangement is the "Stradella" where the basses are in a circle of fifths, e.g., C bass note marked with an indentation or Rhinestone, and G D A E B F# going towards the direction of the player's head and from C F Bb etc. It has a piano keyboard on one side meant to be played with the right hand, attached to the "treble" casing with the sets of the treble reeds installed in it, and a bellows to supply air, and a casing on the left, containing the "bass" sets of reeds, having button keys which usually play chords and bass notes (see below). The piano accordion would be the most common type seen throughout many countries of the world, including the U.S.A. Various types of accordions include Piano Accordion with piano keys, European Chromatic Accordion (having stair-step rows of buttons or keys), Melodeon (Diatonic Button Accordion), and Bayan (Russian Chromatic Accordion).
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