Related Clues:

• Musical comeback
• One who's often not himself?
• Vocal comeback
• One playing the copycat
• Sound in an empty auditorium
• Hills sound
• Pilot's E
• Bounce back, as sound
• Canyon rebound
• Rotunda effect
• Cavern effect
• Tunnel effect
• Amp effect
• "Me too" sort
• Steadily fading sound