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.
— Key Switch is free to use, here at TheoreticallyCorrect.com —
Transpose music the easy way.
Right here at TheoreticallyCorrcect.com