Its a barrel organ that is programmable. This means the pegs on the barrel are removable. The 4 pipes are for flames, controlled by the barrel as well.

You can see the basic idea here. It isn’t really to scale, or showing any system for the flame valves (I don’t know how that would work yet). [UPDATE] here are 2 more images to show the action. The xylophone action and the flame valve action. I would like it to be purely mechanical, though I may have to resort to electronic means.

You can also see a 3d rendering of the inner workings here. Again, not very detailed, just toying with ideas.

I doubt I’ll ever really get this thing together, but it would be neat wouldn’t it?