'National' musical instrument?!!!

How about using the English language with no WORDS or syntactical constructions not derived from Old English. (So you'll lose the word national for a start.)

The impoverished result of our language stripped of its rich acqusitions would be a poor instrument for any literary expression. There's an argument for accepting cultural borrowings all right instead of trying to impose this daft enclosure movement on humankind.

And so--why should music be different from language? Neither can be monocultural.