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Where copper can be found in musical time (2,3,4)

Ross

I believe the answer is:

on the beat

I'm a little stuck... Click here to teach me more about this clue!

'where copper can be found in musical' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'time' is the wordplay.
I cannot really see how this works, but
'time' could be 'beat' (beat is a kind of time) and 'beat' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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