Related Clues:
- Did karaoke
- Crooned a tune
- Performed vocally; Chinese dynasty
- Provided backup, say
- Interpreted numbers
- Took a turn at the karaoke bar
- Performed at the Met
- Did vocals
- Snitched on one's cohorts
- Competed on "The Voice"
- Told the cops everything
- Performed by a chorus
- Entertained with a tune
- Ratted out the bad guys
- Delivered some notes?