The first Pyrophones were made in the late 1800's when Torches were first applied to the ends of tubes, setting up a standing wave inside the tube.  This is my own version using Copper, Aluminum, and Steel.  I create the tone with two Propane torches, and manipulate the pitch and tone by putting the Torch further into and out of the tube ending.   

Thanks to David Franklin for shooting the MPEG.