This past week, the dynamic trombonist and singer joined the roster of one of the most prestigious agents in the music business.  Ted Kurland founded his eponymous company in 1975.  He represents the cream of the crop of international jazz artists including Wynton Marsalis, Terence Blanchard, Sonny Rollins, Chick Corea, Pat Metheny, Ornette Coleman and dozens of others.  Andrews performs tonight at D.B.A.