French philosopher, writer and composer (8)

I believe the answer is:

rousseau

(Other definitions for rousseau that I've seen before include "Jean-Jacques --, Genevan philosopher" , "Jean-Jacques --, Swiss-French philosopher" , "Jean Jacques --, French philosopher" , "Jean-Jacques ......, 18th century philosopher of 'The Social Contract'" , "Is Esau sour about the Swiss philosopher?" .)

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