Communication

obrátit, začít tvrdit něco jiného než původně

So I am a little curious as to what made him change his tune all of a sudden. (Google)

For indeed, her husband did change his tune after spending the evening alone with his two rambunctious young daughters: to one of respect. (Google)

Here is a more recent video on his views about marijuana. It appears the situation in Mexico has made him change his tune. (Google)