Blow-harmonica equipped with 12 notes. Appropriate for children from 3 years and up. The Triola is a colorful introduction to music for children. So easy to play - just press the colored keys the same as shown with the corresponding notes for your favorite nursery rhymes and children"s songs. Children learn to read music through play.The Triola is a handmade and hand-tuned single tone wind harmonica, designed to teach children from 3 years and above. It has 12 notes ranging from G4 to D6, 26.4cm in length and is tuned to C-major. It works by simply blowing into the instrument and pressing the colored keys.