Transpose any of the Christmas carols on this page to any key with Key Switch. Or take a carol you have on hand, copy/paste it into Key Switch, and tranpose. And Key Switch includes a couple of Christmas Carols in its Sample Songs menu, so it's super easy to take it for a spin, online, for free.
Key Switch works with text-based song sheets. It allows you to transpose the chords of any song to any key ... or to Roman numbering.
Here are instructions that explain how to try out Key Switch's sample songs. It's the easiest way to get familiar with Key Switch. And ...
Key Switch is free to use, only here at TheoreticallyCorrect.com
Transpose music the easy way.
Right here at TheoreticallyCorrcect.com