Use Key Switch to transpose these Christmas carols to another key. Take any carol you have on hand, or a song you find online, and copy/paste it into Key Switch. Key Switch works with any text-based song sheet ... and it allows you to transpose the chords of any song to any key, or to Roman numbering.
When you try Key Switch you'll find a couple of Christmas Carols in its Sample Songs menu. The instructions here show you how to try out Key Switch's sample songs. It's the easiest way to get familiar with Key Switch.
— Key Switch is free to use, here at TheoreticallyCorrect.com —
Transpose music the easy way.
Right here at TheoreticallyCorrcect.com