Bee Gees, e.g. (4)

I believe the answer is:

trio

(Other definitions for trio that I've seen before include "Group of Magi?" , "Beethoven's 'Archduke': famous piece written for this ensemble" , "father, spirit and son" , "Musical group" , "Beethoven's 'Archduke', for instance" .)

I've seen this clue in the Penny Press.

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