Wow! I find all this to be just awesomely interesting! Nearly as interesting as it is entertaining, and just the thought of Donald Duck singing Opera or sex-crazed octupi trying to hump a Scottish diving bell caused me, like those Opera singers, to laugh heartily and expel copious amounts of gas as well... although I think in this case it was more like sulphur dioxide, methane, and carbon dioxide rather than helium. And there was no need to take a toot off of a tank immediately prior to said expression, either!

Now if any of ye should be interested in what THAT does to the sound of the Grrreat Heiland pipes (or a tin whistle), I'll defer such research to more studious inquisitors "down Under"; My old Clarke "C" & I AIN'T GOIN' THERE!!! (I'd suggest the "Generation" whistle as an optimum test subject, though).

'Scuse me, Mates; gotta go stir th' beans!

};>{)~