The "Rolling Requiem" of Mozart's work was especially meaningful as it was repeated all over the world, just as the people who died in the attack came from all over the world. On Wednesday, September 11, 2002, at precisely 8:46 a.m., the time of the first attack on the World Trade Center, more than 400 singers performed Mozart's Requiem at Tilles Center for the Performing Arts on the C.W. Post Campus of Long Island University in Brookville. They were one of over 150 choirs from 22 countries and 20 time zones that took part in the Rolling Requiem that provided 24 hours of music in a tribute of hope and healing.

At the Tilles Center, each singer wore a heart-shaped pin with the name of a victim. The performance ended with several moments of silence.

Elizabeth Koehn, president of the Long Island Master Works Chorus said, "I'm so proud to be able to participate in this concert. It was very moving although it was a little hard to sing at times," she said. Her heart pin said "Michael Brennan." She added, "The music itself is so powerful, and the sense of loss and the feeling it is expressing, as you are experiencing it all simultaneously, was very moving."

Charles Temkey, one of the soloists who performs with the LI Philharmonic Orchestra, the Master Works Chorus and with the NYC Opera, remembered the World Trade Center tragedy.

"I was in the city, stuck there for three days, after the September 11 attack. I wanted to help out and give blood and I worked with the Red Cross. It was a good way to spend that time," he said.

Barbara Fusco-Spera, one of the singers, wore a red heart saying "John Crisci."

"Being in the middle of all that sound was so moving and to feel you are giving back and helping someone pull through something difficult is rewarding," said Ms. Fusco-Spera.

Steve Finch, director of the Huntington Chorale Society, one of the conductors at the concert praised the consortium of singers at the Rolling Requiem. "The choruses stayed together. Everybody seemed to be prepared mentally and spiritually." They all came in and ended their parts together, a feat that is unusual with a group singing together for the first time, he explained.

Tenor soloist Greg Mercer wore a red heart saying "Jeffrey Goldflam." He said, "I'm also singing for my friend who was working in the Twin Towers. He was a singer and was temping there, his name is Steve Poulus."

Marli Johnson told Mr. Mercer she saw him singing with the chorus. Her red heart said "Marion Britton". "I was also singing for Christopher Rachaniello, a student at C.W. Post who died too. My grandmother used to say, 'Music can heal because it forces us to listen to one another - and to be together in a peaceful way,'"she said.