Related Clues:
- Violated a code of silence
- Couldn't keep a secret
- Showed off one's pipes
- Let the cat out of the bag, so to speak
- Informed, foremost of teachers getting on in years
- Performed on "The Voice"
- 'All ___ ...'
- Didn't just lip-sync
- Participated on karaoke night
- Spilled the tea
- Tattled to a parent
- Performed like opera singers
- Turned state’s evidence
- Performed karaoke
- Was an active choir member