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why - and indeed how - is the 'musician' sounding the horn? Is he just mindlessly adopting the pose he presumably used prior to death and decomposition? To what degree, if any, is he aware of the absence of sound he is producing, and the consequent futility of his actions?
...and there's plenty of artistic precedent for it:
Maybe a bladder installed in its head? How to ... Make a Draco (3) - the Noise