Related Clues:

• Perform a 36-Down
• Prove one can carry a tune
• Vocalize
• Give away, as a secret
• One way to make a joyful noise
• Not be discreet
• Perform an aria
• ''Of Thee I ___''
• Try out for ''American Idol''
• Emulate a rat
• Save one's own neck, maybe
• Tell all?
• State secrets?
• Spill it
• Turn informer