Shifted opinion and remixed song? (7,4,4)

I believe the answer is:

changed your tune

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'remixed song?' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'shifted opinion and' is the wordplay.
I cannot really understand how this works, but
'shifted' could be 'changed' ('change' can be a synonym of 'shift') and 'changed' is found within the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is found in the answer.
This explanation may well be incorrect...

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

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