Music teaching device and method

A piano roll notation system for Janko-type keyboard having three to six horizontal rows, each row comprising a multitude of touch plates, wherein touch plates for natural notes are colored with a first color and touch plates for accidental notes are colored with a second color, and wherein natural notes are grouped in two groups, one with three keys and another with four keys, and where members of the three key group carry a marking, and wherein accidental notes are grouped in two groups, one with two keys and another with three keys, and where the members of the two key group carry a marking, said system comprising:

• vertical lanes of a first and a second color corresponding to the color of the touch plates of the keyboard;
• said lanes being lighter where a lane corresponds to a touch plate that has a marking;
• colored rectangles representing notes to be played and a length of the rectangles representing duration of the notes, wherein color of notes to be played with right hand is different from color of notes to be played with left hand.