"mains hum" . "buzz" . "electric hum" . . "ground hum" . "hum from nearby AC power wires" . . . "Mains_hum#In_video_systems" . "Mains hum#Humbucking" . . "hums and buzzes" . "hum" . . . "Hum" . . "Mains hum" . "50 Hz noise" . "speaker buzz" . "humbucking" . . . . "Mains hum" . "60-cycle hum" . "60 Hz noise" . . "power line hum" .