Display apparatus provides for concurrent visual display and audible reproduction of musical notes individually or in plural. In one embodiment, a top octave generator operates responsively to an input signal having a characteristic which is variable in accordance with the relative positioning of visual display components of the apparatus. In a second embodiment a tone generator provides top octave and lower octave signals and selection is made for audible reproduction by a switching arrangement responsive to relative positioning of visual display components.

A musical instrument for musical therapy which stimulates and urges patients suffering from dementia, aphasia, and other functional disorders of the brain to voluntarily play and to sing a song comprises an indicating part for displaying the lyrics of a song or other musical indicia in a predetermined pattern, an operating panel, and a scale generator. The indicating part is mounted upon the operating panel, which is provided with a plurality of switch elements arranged in physical alignment with the respective lyrics of the song or other musical indicia. The plural switch elements are connected to the scale generator such that a musical tone or voice signal is output by the scale generator in accordance with a selected switch element. By use of the inventive device, a patient is stimulated and urged to sing the song when the patient successively activates the switch elements corresponding to the displayed lyrics of the song.

A teaching device having a base member with a metallic sheet thereon and a power source and indicator lamp assembly electrically connected to the metallic sheet. A clip is provided on the base member, also connected to the power source, and spaced from the metallic sheet. A question and answer folder is mounted on the base member with the clip in electrical connection with a metallic foil which is part of the question and answer folder. The question and answer folder has a control opening in registration with a correct answer indicia whereby finger pressure on the correct answer indicia causes an electrical connection to be made between the metallic foil of the question and answer sheet and the metallic sheet on the base member to complete the electrical circuit to the indicator lamp. The question and answer folder is openable so as to be easily mounted and electrically connected to the contact member of the base member and the portions of the question and answer folder are connected together so as to always be in registration with each other.

Disclosed is an electronic game apparatus that in its preferred embodiment may be used either to play a game of musical concentration or else as a musical instrument. The apparatus is provided with an on-off switch, four mode buttons and a 5 by 5 keyboard having 24 active designator buttons. When the apparatus is placed in the musical instrument mode, each keyboard button is associated with a different musical note in the chromatic scale; thus the instrument is capable of playing two full chromatic octaves. When the apparatus is operated in one of its game modes, (some of which may be "easy"; other "difficult") a number of different tunes, each having an average length of approximately ten notes, are each assigned by the apparatus at the commencement of a game to a pair of designator buttons of the keyboard in a random or apparently random manner unknown to the players at the game's commencement. For each turn of play, a player depresses a first designator button, hears at least a portion of the tune assigned to that button, and then attempts to match it with the other button also assigned to that same tune by depressing a second designator button.

An audio-visual teaching machine so made that, when any one of a plurality of independent visual teaching contents respectively appearing in a plurality of windows is pressed with a finger, an audio teaching content corresponding to the pressed visual teaching content may be automatically reproduced so as to be able to efficiently teach with a simple operation. This teaching machine is used together with a teaching card having a plurality of visual teaching contents on one surface and a plurality of magnetic tracks containing audio teaching contents corresponding to the respective visual teaching contents on the other surface. Until the teaching card is correctly set in the teaching machine, a buzzer will continue to sound. When the visual teaching content appearing in the window is pressed with a finger while the teaching card is set in a correct position, a lamp will be lighted to illuminate the window.