system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What causes the audible electric 'buzzing' sound from high voltage power lines?
gpt
It's oxygen molecules being charged with electricity. When the charged particles give back that energy they emit light and with a high enough charge the energy transformation of these particles can also be heard as a buzzing sound. 

The extreme example would be lightning - particles charged up to a million volt that will make a big boom when discharging, that is the thunder you will hear accompanying the lightning bolt.