Ruben's Flaming Tube
Mythbusters – Ruben's Flaming Tube, visual representation of “The standing wave”.
Pipe/Tube filled with gas, Sealed. Speaker on one ender, gas on other. Then little perferations. Standing waves rendered in fire.
Higher and lower sound waves compression affecting the gas flow.
Around since 1905.
http://www.youtube.com/results?search_query=ruben%27s+flame+mythbusters&aq=f