Proposed is a device for teaching music theory, with a flat, one part or multi-part board made of wood, carboard, plastic or a similar substantially rigid material with a work surface having non-detachable and easily recognizable note systems. The work surface can be written or printed on and covered with a layer of adhesive felt or a magnetic sheet, or a sheet which is adherent in some other comparable way, on which light moulded elements in the shape of any of the notes and other symbols used in the typesetting of music can be easily placed and removed again by hand. The backs of the moulded elements are fitted with hook-and-loop or magnetic, or some other comparable adherent means. The notes and the symbols are made of metal, plastic, wood, rubber or a similar substantially rigid or readily plastically formable material and their surfaces has coloured coatings, or they are made of materials of different colours.