I love Christmas carols, and so I loved hearing these two groups at the Disneyland Resort last year:
1. The Buena Vista Street Community Bell Ringers in DCA. They're more about singing than bell ringing, and they're great! They did one excellent song last year that I've never heard before.
2. The carolers who perform in Disneyland's hotels. I liked hearing them in the Grand Californian because that place is so beautiful at Christmas. They take requests!