
Change your tune
Attitude Shift
Used when someone significantly alters their viewpoint, often unexpectedly.

She didn't want to go, but she changed her tune when I mentioned the free food.
Possible Irony
Can be used ironically if the change seems selfish or opportunistic.

Once he heard there was a reward, he suddenly changed his tune about helping.
Informality
An informal idiom, common in spoken English or informal writing.

My brother changed his tune about chores once he wanted money for a new game.
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