How To Play Button Accordion by Henry Doktorski is unique, as every other button-method does not recognize the simple fact that the button-accordion is a transposing instrument and all its music can be written in the key of “C.” There are button-accordions in practically every key including C, G, D, F & Bb. Because the one-row button-accordion is a transposing instrument, a player only needs to learn the fingering & notes for one scale: the C major scale. In order to play in another key, you wou...