Related Clues:

• Do some karaoke
• Emulate Justin Bieber
• Be a rat fink
• Rat on the Mob
• Belt one out
• Participate in karaoke
• Be a teller
• Perform with the choir
• Join the chorus
• Go caroling
• Try out for "American Idol"
• Do a tune
• Compete on ''American Idol''
• Inform on someone
• Divulge secrets