tastemaker

noun

1. A trendsetter with respect to taste.

   “The tastemakers have just discovered his work.”

   “SMILE WHEN YOU CALL AN ART worldling a "tastemaker." […] Where previous great tastemakers such as the Steins, the artist Marcel Duchamp and the dealer Alfred Stieglitz were dedicated amateurs, few in number, today there are swarms of them whose interests are professional or commercial.”

   “[Paul] Graham became an essential tastemaker for startups and startup culture in Silicon Valley.”