change your tune (idiom)

I needed to change my tune after Ann told me the truth about Jim.
When confronted with evidence, he had to change his tune and admit that he was wrong about the situation.
Initially, she opposed the idea, but after seeing the benefits, she began to change her tune and support the proposal.
The politician seemed to change his tune on environmental issues after public opinion shifted in favor of sustainability.
The employee had to change his tune when he realized that his negative attitude was affecting team morale.