Consequences of the end of Rock and Roll?????

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Here's a quote from From the Repertoire: Western Music History through Performance.

Plato:  "The overseers must be watchful against its insensible corruption.  For a change to a new type of music is something to beware of as a hazard of all our fortunes.  For the modes of music are never disturbed without unsettling of the most fundamental political and social conventions."

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