Which musician turned down the medal of Freedom twice?

That is correct. Dolly Parton shared in interviews that she was offered the Presidential Medal of Freedom—the highest civilian honor in the United States—during Donald Trump's first term, but had to decline both times.

The first time, she couldn't accept because her husband was ill, and the second time, she declined because she wasn't traveling due to the COVID-19 pandemic. She also mentioned later that because of the attention surrounding those turned-down offers, she would be hesitant to accept it in the future to avoid looking like she was getting involved in politics.