Karén Hakobyan, an Armenian-American pianist and composer, will perform in the Salon Series at the Parrish Art Museum in Water Mill tomorrow at 6 p.m. Since his debut at Carnegie Hall at the age of 17, Mr. Hakobyan has performed in concert halls in Europe, Latin America, and the United States, won prizes at many piano competitions, performed on radio stations here and abroad, and earned awards for his compositions.