This classroom music tool helps students recognize pitches and intervals, and intuitively develop mathematical and spatial relationships as a result. Working with Triolas additionally teaches cooperation and compromise. The 24 instruments and the 24 accomanying workbooks are shipped in a presentable display. The Triola is a blow-harmonica with 12 notes (the chromatic version of the instrument is sometimes referred to as a Hooter). The Triola is a colourful introduction to music for children. So easy to play - just press the coloured keys corresponding with the coloured notes to your favorite nursery rhymes and children's songs. Children learn to read music through play.