Teaching aid for music - has pushbuttons allocated to musical notes, and cards perforated in accordance with notes of given piece of music

摘要

A system is used for teaching musical rotation so that tunes may be played in a variety of keys. The device has a series of pushbuttons (11) arranged in seven groups corresponding to the seven musical notes of an ordinary scale. There is a series of cards (4), with each card punched in accordance with the notes of the musical piece, and there are systems for reproduction of sounds in accordance with each note. Push-buttons (11) allocated to each hole are at first inserted into the holes, and then they are consecutively pressed down.