C. A. Seydel Söhne is the oldest harmonica factory in the world still in existence. The Triola is designed to teach children from the age of 2 and above how to read and play music. It works by simply blowing into the instrument and pressing the coloured keys. The coloured keys correspond with the coloured notes on the music.
It is available in two sizes: With 12 notes from G to D, 26.4cm in length and with 8 notes (an octave) from Middle C to C, 20.4cm in length.