From Isaac Asimov's science fiction series 'Foundation', specifically the section of 'Foundation and Empire' entitled 'The Mule', the visisonar is considered a musical instrument.
Unlike most instruments, this one does not achieve its effect by using sonic effects but, instead, directly stimulates the listeners' mental well-being. The number of people and level of effect depends on the skill level of the player. As this was a device from the First Empire, there were not that many people around with any skill at all. However, the Mule's clown, Magnifico, had some skill with the instrument and was asked to play for select parties on the Foundation and for large groups of workers on Haven. This may not have been a good idea...
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