Accordion and electronic accordion

An accordion comprising:

• 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;
• four rows of buttons provided on at least one of the right hand play side and the left hand play side;
• and
• one row of buttons provided adjacent to the bellow side of the four rows of buttons or opposite bellow side of the four rows of buttons,
• wherein
• the four rows of buttons include:
• a first column to which first continuous four pitches are assigned;
• a second column, provided adjacent to the first column, to which second continuous four pitches are assigned, the second continuous four pitches being adjacent to the first continuous four pitches;
• and
• a third column, provided adjacent to the second column, to which third continuous four pitches are assigned, the third continuous four pitches being adjacent to the second continuous four pitches;
• the one row of buttons include:
• a first column, provided adjacent to the first column of the four rows of buttons, to which first pitch is assigned, the first pitch being continuous from or to the first continuous four pitches;
• a second column, provided adjacent to the second column of the four rows of buttons, to which second pitch is assigned, the second pitch being continuous from or to the second continuous four pitches;
• and
• a third column, provided adjacent to the third column of the four rows of buttons, to which third pitch is assigned, the third pitch being continuous from or to the third continuous four pitches.

An electronic accordion comprising:

• 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;
• four rows of buttons provided on at least one of the right hand play side and the left hand play side;
• two rows of buttons provided adjacent to the bellow side of the four rows of buttons or opposite bellow side of the four rows of buttons;
• and
• a controller configured to execute:
• assigning first continuous four pitches to a first column of the four rows of buttons;
• assigning second continuous four pitches to a second column of the four rows of buttons, the second continuous four pitches being adjacent to the first continuous four pitches, and the second column of the four rows of buttons being provided adjacent to the first column of the four rows of buttons;
• assigning third continuous four pitches to a third column of the four rows of buttons, third continuous four pitches being adjacent to the second continuous four pitches, and the third column of the four rows of buttons being provided adjacent to the second column of the four rows of buttons;
• assigning first continuous two pitches to a first column of the two rows of buttons, the first continuous two pitches being continuous from or to the first continuous four pitches, and the first column of the two rows of buttons being provided adjacent to the first column of the four rows of buttons;
• assigning second continuous two pitches to a second column of the two rows of buttons, the second continuous two pitches being continuous from or to the second continuous four pitches, and the second column of the two rows of buttons being provided adjacent to the second column of the four rows of buttons;
• and
• assigning third continuous two pitches to a third column of the two rows of buttons, the third continuous two pitches being continuous from or to the third continuous four pitches, and the third column of the two rows of buttons being provided adjacent to the third column of the four rows of buttons.