Folk singer performs a moving rendition of his classic song at the World Trade Center memorial
Paul Simon provided one of the high points of Sunday's 9/11 tenth anniversary ceremonies with his stripped down version of "Sound of Silence."
The singer was originally supposed to perform "Bridge Over Troubled Waters" to commemorate the World Trade Center memorial, but he apparently changed his mind.
Given the emotional reaction from the audience he picked the perfect song to encapsulate a day of mourning and reflection.
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