Media giant Clear Channel is getting into the arts in a big way. “Starting next year, Clear Channel Communications Inc. plans to send a large wooden version of the Trojan horse on a tour of U.S. museums as a frontispiece to an exhibition on ancient Greece and Troy. Clear Channel’s empire-building in the arts extends further — to touring Broadway musicals, where its omnipresence as a producer and presenter can mean trouble for competitors and cause wariness even among its partners. Cultural gatekeepers, including art critics and museum directors, have begun sounding a warning: Beware of a conglomerate bearing art.”