Related Clues:
- Performed ballads, e.g.
- Communicated using notes
- Showed disloyalty
- Like some numbers
- Auditioned for 'American Idol'
- Delivered in parts?
- Like karaoke performances
- Emulated a canary
- Like an aria
- Emulated a rat
- Provided backup, perhaps
- Was a ratfink
- Aired out one's pipes
- Like most pop hits
- Squealed, so to speak