BILLY TEST PERFORMS FRIDAY JULY 6 AT SOPHIE'S  photo: Annemarie Mountz   NBJP: Who's your favorite non-jazz composer? BT: I'm a huge fan of classical music, and I have a strong background in classical piano.  However, it's extremely difficult for me to select a single composer.  I love Russian composers: Rachmaninoff, Scriabin, Tchaikovsky, etc.  I'm also very influenced by French Impressionistic composers