A diatonic button accordion (DBA) is a member of the free-reed aerophone family of musical instruments. It is a type of button accordion on which the melody-side keyboard contains one or more rows of buttons, with each row producing the notes of a single diatonic scale. The buttons on the bass-side keyboard are most commonly arranged in pairs, with one button of a pair sounding the fundamental of a chord and the other the corresponding major triad (or, sometimes, a minor triad).
Diatonic button accordions are popular in many countries, and used mainly for playing popular music and traditional folk music, and modern offshoots of these genres.
Read more about Diatonic Button Accordion: Nomenclature, Action, Distribution of Notes On The Keyboard and Range, Available Keys, Multi-row Systems, Bass Systems, Geographical Variations On The DBA Theme, Advantages and Disadvantages of The Diatonic System, Notable Players
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“What is the life of man! Is it not to shift from side to side?—from sorrow to sorrow?—to button up one cause of vexation!—and unbutton another!”
—Laurence Sterne (1713–1768)