Stradella bass system

Main article: Accordion
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.

  1. ^ "Models and Specifications". Titano Accordion Company. Archived from the original on 2020-05-27. Retrieved 2020-05-27.