Maids a-milking of a Christmas carol, e.g. (5)

I believe the answer is:

octet

(Other definitions for octet that I've seen before include "Lines of verse" , "Mendelssohn wrote this" , "Mendelssohn or Schubert piece" , "Musical group" , "Medieval Latin hymn" .)

I've seen this clue in The Washington Post.

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