A middle school choir talks about being told to stop singing the National Anthem at the 9/11 Memorial. <script type='text/javascript' src='http://z.cdn.turner.com/cnn/van/resources/scripts/van-widgets.js'></script> <div data-cnnvansinglewidget data-affiliate='gantdaily' data-videoid='van/ns-acc/2016/04/25/NE-017MO_CNNA-ST1-10000000034914a4' data-size='auto' data-autostart='true'></div>