I work in an office where most of us sit in cubes and that means that you have no audio privacy. I can hear just about everything that goes on in the adjacent cubes. To counteract this noise annoyance a lot of people listen to music.
Most people use headphones and keep them at a reasonable volume, but others turn it up so loud that the headphones act more like little crappy speakers. I think the sound coming out of headphones is more annoying than just hearing the music come from the desktop speakers. That is enough of me ranting; “hear” is a new Office Etiquette.