It contains holy text that choristers share in harmony (4,5)
I believe the answer is:
hymn sheet
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for hymn sheet that I've seen before include "Advice is to sing from the same one" , "It shows what's to be sung" .)
I've seen this clue in The Guardian.
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