At first the glockenspiel has only the note middle C on it and is “one note old." Each time the student learns how to write a note on the music paper and play a new song with it, they get a new note, ...

Using a cast-off glockenspiel from a school music room as a base, the Spielatron uses four mallets to play all the notes. Each key is struck by a mallet secured to a base made of two servos.