The Boomwhackers Diatonic Set is by far our most popular Boomwhacker set. They can be used alone or in combinations with other melodic or percussion instruments. Consists of eight notes: C to C. When you add the Chromatic set you have the full chromatic octave scale available. Add the Boomwhackers Bass Chromatic set to your melodic set and you will be amazed at the depth of sound you will achieve. Tactile, resonant and fun for students of all ages.