A children's choir serenaded the couple with "Can't Take My Eyes Off of You" during their big day
Credit: Eric Charbonneau/WireImage

Blake Lively and Ryan Reynolds‘s hush-hush wedding had the perfect soundtrack – and much of it was live.

As PEOPLE initially reported, the Gossip Girl star’s pal Florence Welch (of Florence + the Machine) was on hand to perform at the reception, where she sang three songs (including “Cosmic Love” and “Somewhere Over the Rainbow”) as a gift to the couple. And a deejay spun tunes at the reception, held in a tent near the Cotton Docks at Boone Hall Plantation in Mt. Pleasant, S.C.

But that wasn’t all.

A choir of 10 children, from First Baptist Church, sang “Can’t Take My Eyes Off of You” by Frankie Valli, as the bride walked down the aisle Sept. 9.

“It was very nice,” a source said of the serenade.

To protect the couple’s privacy, and ensure the discretion and secrecy of the day, the parents of the kids singing were given non-disclosure agreements to sign, and their cell phones were taken before the ceremony began.

A rep for the children from First Baptist Church School told PEOPLE they were thrilled the kids got to participate in Lively and Reynolds’s big day.

“We were so excited when we learned the children performed in Blake Lively s wedding,” the rep says. “We learned about it on the radio.”