Paul Simon performs during ceremonies marking the 10th anniversary of the 9/11 attacks on the World Trade Center, in New York. (Allan Tannenbaum/Reuters)

With red eyes, the folk legend performed “The Sound of Silence” in what NPR’s Margot Alder called “perhaps the most moving moment of the ceremony.”

The rendition even touched NBC’s Tom Brokaw, who the Associated Press reports briefly lost his composure after Simon’s performance.

“Music is such a critical part of these kinds of ceremonies,” the veteran anchor said. “It evokes memories, speaks to us in a way that our everyday language cannot.”

Watch Simon’s performance below.