Bagpipers opened the gathering, the Brooklyn Youth Chorus sang the national anthem, the cellist Yo-Yo Ma performed, and Paul Simon played his classic song The Sounds Of Silence.

BBC: 9/11 anniversary: Sombre US honours victims 10 years on

Joining it will be Chubby Checker's 1960's dance hit The Twist and Sounds of Silence by Simon and Garfunkel.

BBC: Pink Floyd album to be preserved by US Library

Later, the 1966 album "Sounds of Silence" by Paul Simon and Art Garfunkel was a hit in its day but not before the duo struggled and split early on.

WSJ: Sounds of Simon, Garfunkel chosen for preservation

Because of the grant that went to this company, we can hear the sounds of machines humming and people doing their work, instead of just the ghostly silence of an emptied-out building and the memory of workers who were laid off a long time ago.

WHITEHOUSE: Creating a Green Impact Zone

It catches investors when their guard is low but their trust is high, and once a co-worker or colleague confirms its working for them, the sounds of a cash register ringing can silence more rationale thoughts.

FORBES: Avoid Church and Rotary In Retirement

Its subsequent success prompted the duo to reunite and record another album entitled Sounds of Silence in 1966, which Garfunkel said was a life changer for him and his partner, Simon.

BBC: Pink Floyd album to be preserved by US Library

Search and rescue teams toiled through the night, working in silence so as not to miss sounds of life.

WSJ: After Oklahoma Tornadoes, Rescue Efforts Focus on Survivors