Sound travels in waves, and is measured in hertz (Hz). When editing a song that contains a bad word, instead of just taking the word out and messing up the beat of the song, you can reverse the word, so that the song flows smoothly, and the word in inaudible.
Hearing loss is becoming more and more of an issue with our generation. Wearing headphones is a big cause of people younger than 65 losing their hearing, and hearing loss is not reversible. Our generation is overly exposed to noise with sirens, concerts, big events, etc. The average age that one starts to lose their hearing with decrease dramatically over the next 20-30 years because of our exposure to noise.
