An accordion includes a right hand play side, a left hand play side, a bellow provided between the right hand play side and the left hand play side. A plurality of columns of buttons provide on at least one of the right hand play side and the left hand play side. Each of the plurality of columns may have at least three buttons to which three single pitches are assigned, the three single pitches constituting a triad major chord. Embodiments of the present invention provide a user-friendly system for accordionists that can also cover more than 90% of the accordion songs being public in the world.

A smart music device and process provide users with an interface to play a selected song in the correct song key. The device includes a graphical user interface with areas demarcated by translucent conductive ink printed on the layer's underside. A layer of force sensor resistors (FSRs) are under the areas. Touching one of the areas closes a circuit between then conductive ink and FSR triggering a note to be played. The demarcated areas are illuminated to guide the user on scale and root node position. Metadata in memory storage includes the song key which is used during song playback to trigger assignment of the key correct scale across the FSRs and illuminate its root position of musical notes. Touching an area triggers a signal sent to a connected musical instrument to play the note.