Look Mum No Computer built a propane-fed pipe organ that ignites its own exhaust. The instrument sits on a trailer, runs copper organ pipes fed by gas valves, and produces both music and live flame on command. The fire is a byproduct. The sound comes from propane moving through the pipes, same acoustic principle as any organ.
The ignition system is the engineering story here. An earlier design used pilot lights, which wasted fuel and blew out. The current build replaces them with automotive spark plugs and ignition coils triggered by the same MIDI signal controlling the gas valves. One signal, one event: valve opens, spark fires, pipe sings, flame appears. That tight integration is what makes the full performance at 16:47 worth watching.
Tuning remains unresolved, which the builder acknowledges. This is Part 7 of a documented construction series, so the original article links directly to the full channel for earlier build breakdowns. If you want to understand how MIDI, combustion hardware, and pipe acoustics get wired together on a budget and on a trailer, the source video is the place to start.
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