NEW YORK (AP) - They were there to observe, not to perform. But that didn't keep fans from chanting for Jay-Z and Beyonce as they attended a rally in New York City over the weekend. They were among the hundreds of demonstrators who joined Trayvon Martin's mother Saturday at a rally seeking justice for the slain black teenager. The noontime "Justice for Trayvon" rally was held as temperatures topped 90 degrees. But the heat didn't stop some from wearing hoodies while walking across the Brooklyn Bridge, chanting Martin's name. There were rallies held in about 100 cities a week after a Florida jury acquitted neighborhood watch volunteer George Zimmerman in Martin's death.