Button accordions are accordions on which melody-side keyboard consists of series of buttons .There are mainly two kinds of button accordions-diatonic and chromatic. But there is another version of button accordion known as Cajun accordion. It is a single row accordion. Button accordions were first developed in 1850 by Franz Walther.
Although the main components of the different kinds of button accordions are same, the variation is in the keyboard systems, action, tuning and construction of the instruments.
Diatonic button accordions have 2-3 rows buttons. Each of the rows is tuned to a specific key. You can basically see these musical instruments in the music genres like Norteño and Cajun music. They are Bisonoric. This means that same button has the ability to generate two sounds. In the diatonic variety, there are no accidentals.
The chromatic button accordions, on the other hand, are unisonoric. This means same button can produce only one sound. These accordions have three to five rows buttons and aren’t limited to one particular key like diatonic button accordions. These instruments are popular in French music. In this kind of accordion the melody-sided keyboard consists on rows of buttons organized chromatically. Bass-side keyboard is generally the Stradella system or a free-bass system. Among chromatic button accordions, Schrammel and Russian bayan accordions are the most popular.
There are mainly four components of button accordions-bellows, reeds, keys or buttons and switches. The accordions have a treble part that generally encases reeds and the bass side that have the keys or buttons. The keys or buttons manage the pitch that’s on treble part and there are generally buttons on bass side, which are difficult to notice but may be identified tactfully with something such as crosshatch or gem pattern. Bellows are regarded as the sole of the button accordions because these actually expand and contract into reeds. They are generally made up of paper. Then there are switches, which control and deal with the voice of the accordions.