No kidding! Dylan has an album of traditional Christmas songs.

When I first heard that, I thought it was a joke. Even in his younger days he didn't exactly have a traditional-sounding voice. And now that he's in his late 60s, his voice is even... less traditional.
Here's the album on Amazon.com. You can scroll down and click the little arrow before each song and hear a sample. Be forewarned... it's interesting.

I think
Have Yourself a Merry Little Christmas is the most interesting. You could grate cheese with that voice.
Christmas in the Heart