Sing a different tune
Meaning
Change one's opinion or attitude.
Usage
Used when someone reverses course.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Musical metaphor for altering one's song.
Widely used in 19th-century prose and newspapers.