Crossword Genius

What singers do to find what they have in common? (7,5)

Ross

I believe the answer is:

compare notes

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If this is the answer I cannot explain how the clue works.

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(Other definitions for compare notes that I've seen before include "See how others have done it" , "Exchange experiences" , "Exchange ideas about something" .)

I've seen this clue in the Evening Standard.
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