The Magi, e.g. (4)

I believe the answer is:

trio

(Other definitions for trio that I've seen before include "Ensemble musical piece, eg Beethoven's 'Archduke'" , "Musical group" , "Band of three" , "Bee Gees, Supremes or Andrews Sisters, say" , "Group of three (musicians)" .)

I've seen this clue in The Wall Street Journal.

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