Boomwhackers Boomophone C Major Diatonic Set of 8 Tubes. Taking that concept forward into an adaptable and practical format is the latest global 'music and colour' craze - Boomwhackers! Logical and easy to understand, the Chroma-Notes colour system starts with the note 'C' being red, and then essentially proceeds through the colour wheel as the notes correspondingly progress through the chromatic musical scale.
