Prince William, Kate Middleton Check Out Westminster Abbey's Orchestra
03/08/2011 AT 02:25 PM EST
The visit's purpose? Sorting out the musical arrangements for the April 29 ceremony.
William, 28, and his bride-to-be, 29, alongside the groom's father, Prince Charles, arrived in a dark blue Jaguar around 8 p.m. Once inside, the trio sat in a pew a few rows from the altar while a full orchestra and a boy's choir rehearsed.
They "listened to some of the music that will be played at the wedding, but not all of it," a senior royal source tells Britain's Express newspaper. "The orchestra also had a few pieces that they had wanted the bride and groom to hear."
The couple were advised by Prince Charles, who has "always taken a close interest in classical and church music," the source says, and they will have chosen which music will be used and which they wanted to omit.
"They looked relaxed and seemed to enjoy themselves," says the source. "They are obviously very keen that everything should be right on the big day."
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