The original was in F (one flat), best for ATBB or TTBB voices. Most editions at CPDL transpose it up to G, A-flat, or A. The (currently) most recent edition by David Masao Zimmerman in G is excellent.
Thank you. That is very helpful. I suspect to be a useful chorister, I should get used to singing it in several keys. I have in fact had someone turn to me at Midnight Mass and ask if I knew it becasue they were down a voice. I do chant but I decided I should branch out.
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