When it was all over, the bus driver said it best.

Henry Hill, 57, was on his day off, truly a busman's holiday, but he went to the Kimmel Center to see the Joybells - a handbell choir of 12 men and women with Down syndrome - perform a Christmas concert with the Chamber Orchestra of Philadelphia.

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"Two different cultures blended as one," said Hill, who ordinarily drives the Joybells, although at the moment the bus is broken. "They blended their music, and it sounded magical. Nothing here but unconditional love. I'm so warm right now, I don't even need my longjohns going home."

This collaboration was the first between a handbell choir of disabled adults and a world-class orchestra, according to those involved, and it was three years in the making.

The Joybells began attending open rehearsals of the chamber orchestra and developed a relationship with its director, Dirk Brossé, who also attended Joybells performances to assess the musicians' ability.

He then spent months writing the arrangements - highlighting the virtuosity of chamber musicians during intros and interludes, shining a light on the Joybells in melodies.

The groups assembled in September for the first time to rehearse together and record a CD.

Orchestra members showed up thinking it was just another gig. "Christmas music in September?" bass player Miles Davis thought. "I'm not ready for this."

He ended up in tears, as did many other orchestra members.

"I was totally caught up in it," said Davis. "It makes you question your assumptions about what ability means and what appreciation means."

"It was probably one of the finest performances in all of our lives," said Brossé, the conductor, who also shed tears that day. "The Joybells showed such joy and enthusiasm on stage, with such positive energy, that it pushed the orchestra and myself to embrace our music-making through their eyes."

The Joybells are from Melmark, a community that provides a range of services for disabled adults and children on 100 acres of gorgeous land in Newtown Square. Half of those receiving help live there, the others attend day programs.

The property was bought for $160,000 in 1966 by Paul and Mildred Krentel after the birth of their daughter with Down syndrome. That was an era of institutionalization, and rather than send their daughter away, they started their own home in Delaware County for children like her.

In 1970, Mildred bought toy bells and started a bell choir for the children. She wrote out simple melodies and pointed at each child when it was time to ring a bell. The children radiated such joy, she named them the Joybells.

More than 40 years later, the concept is the same, though much more sophisticated, adding harmonies and chords. The 12 Joybells line up in a row, modeling a piano keyboard, each member playing multiple bells across five octaves.

The Joybells - now adults ages 25 to 50, half of whom grew up at Melmark - still rely on cues from directors Sue Graves and Catie Parker.

At one point Sunday, during "Joy to the World," Graves, who has been director for 24 years, resembled a basketball player making a no-look pass - her arms were stretched to her left, using sign language to signal choir members on that side, but giving a head nod to Christian White, to her right, signaling him to stop ringing a chime.

September's magic with the orchestra was recaptured Sunday, if not surpassed, at the Kimmel. With Brossé away in Belgium, the chamber orchestra was led by guest conductor Gary White in two free shows, at 10 a.m. and 2 p.m., held in the large open lobby known as Commonwealth Plaza.

In the morning, Priscilla Hollerback, 50, from Hatboro, watched from a balcony and kept wiping away her tears. After "Silent Night," she whispered, "My God, so beautiful."

In the afternoon, Diane Dooley, 53, closed her eyes and was swept away. "I am loving it," she said. "It's completely touching my heart."

People stood on tiptoes to see. Many began to tap the air with their fingers as though they were ringing bells.

The Joybells were joyous. Each of the five women - Valerie Barksdale, Lisa Burgwald, Megan Penman, Sarah Waldron, and Meg Garner - did a little curtsy when introduced, and, between numbers, hugged and high-fived one another, they were so happy.

Ronnie Grass was a rock at the end of the table, ringing the biggest brass bells, each as heavy as a bowling ball.

"I play a lot of heavy bells," he explained, "because of my muscle."

After the final song in the morning performance, there was a common glow, as the bus driver said, a warmth in the Kimmel lobby, a recognition that something wonderful had just happened.

"I loved it," said Mark Deschodt, a Joybell. "I was happy."

Was it hard?

"No."

Graves, the director, interrupted.

"Do not quote him on that!"

After the second concert, the Joybells didn't have time to linger, as they had in the morning, for hugs, pictures, and even a few autographs. They headed off to New York, where they were to do a taping Monday morning for the Today show, to air on Christmas.

"To me, it's so exciting to give them an opportunity to shine," said Graves, "to focus on their ability and not their disability. Every life has meaning and purpose, and it's a message that needs to be heard."

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@MichaelVitez