Kenneth Thunder Drum เคนเน็ธ เสียงฟ้าร้อง
จะใช้ในห้องเรียนสำหรับเด็กเล็กๆเพื่อการเรียนรู้ หรือจะใช้เล่นในงานปาร์ตี้สังสรรค์ หรือใช้เชียร์บอลก็ได้
Thunder drums “thunder” when vibrations in a spring are transmitted through a drumhead and amplified in an open tube. The vibrating spring causes the drumhead to vibrate, which in turn causes the air inside the drum to vibrate. The air in the drum begins to resonate, and the volume of the sound increases.
The whirly tube, corrugaphone, or bloogle resonator, also sold as Free-Ka in the 1960’s-1970’s, is an experimental musical instrument which consists of a corrugated (ribbed) plastic tube or hose (hollow flexible cylinder), open at both ends and possibly wider at one end (bell), the thinner of which is rotated in a circle to play. It may be a few feet long and about a few inches wide. The faster the toy is swung the higher the pitch of the note it produces, and it produces discrete notes in the harmonic series like a valveless brass instrument, but the fundamental and second harmonic are difficult to excite. To be played in concert the length of the tube must be trimmed to tune it. Hornbostel–Sachs number: 412.22, the tube is a whirling (turns on its axis) non-idiophonic (reedless) interruptive free aerophone, but is usually included in the percussion section with sound effects such as chains, clappers, and thunder sheets.