Boomwhacker sets are a great tool to teach children about notes. Boomwhackers are popular among kids and adults of all ages. The tubes are perfectly tuned to different musical notes which are clearly marked on their labels. Hundreds of songs can be played on the various Boomwhacker sets - pentatonic, diatonic, and chromatic. You can also play chords by combining the tones. Whack almost anything to produce tones - thigh, hand, table, chair, floor, etc. Different surfaces produce different sounds, but always the same musical pitch. This exciting new product is sure to be a musical favorite!