Related Clues:

• Trolled
• 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