Paul Simon performed his signature song The Sound of Silence at the memorial service held at the ground zero on Sunday, the 10th anniversary of the Sept. 11 attack where nearly 3,000 lives were lost.

Wearing a 9/11 memorial baseball cap, he sang the Simon & Garfunkel classic The Sound of Silence, which resonated with the hearts of bereaved family members and dignitaries.

On Sept. 21, 2001, just shortly after the 9/11 attacks, Simon performed Bridge Over Troubled Water on America: A Tribute to Heroes benefit concert dedicated for 9/11 victims and their families.

His 2006 Album Surprise was in large inspired by the 9/11 attacks and the U.S. military responses that followed.

Paul Simon still has it. Incredibly moving performance. 9-11, tweeted one person regarding his 9/11 Sound of Silence performance.

The Sound of Silence Lyrics:

Hello darkness, my old friend

I've come to talk with you again

Because a vision softly creeping

Left its seeds while I was sleeping

And the vision that was planted in my brain

Still remains

Within the sound of silence

In restless dreams I walked alone

Narrow streets of cobblestone

'Neath the halo of a street lamp

I turn my collar to the cold and damp

When my eyes were stabbed by the flash of a neon light

That split the night

And touched the sound of silence

And in the naked light I saw

Ten thousand people maybe more

People talking without speaking

People hearing without listening

People writing songs that voices never shared

No one dared

Disturb the sound of silence

Fools, said I, you do not know

Silence like a cancer grows

Hear my words that I might teach you

Take my arms that I might reach you

But my words like silent raindrops fell

And echoed in the wells of silence

And the people bowed and prayed

To the neon god they made

And the sign flashed out its warning

In the words that it was forming

And the sign said The words of the prophets are written on the subway walls

And tenement halls

And whispered in the sound of silence