What auditory hallucinations have you had?

I'd like to know what others experience has been like.

I noticed a repetitive sound today like an alarm that just kept replaying. I thought it was coming from my bathroom because I have speakers there for music but nothing was playing and the sound momentarily stopped. I went back to my bedroom but it immediately resumed and sounded like it was coming from my bathroom again so I checked, then the living room, then the bathroom again and after feeling like I was going to explode, I realized that I was hallucinating the sound. This has only happened a few times so it wasn't my first guess but it's usually a repetitive sound that I feel is "coming from another room". After a while of being agitated it's very obvious the sound isn't real when I plug my ears and the volume doesn't change.

Last time, I had a strings orchestra playing the same passage over and over for days and then one day it just stopped and didn't come back. I get startled easily when this happens because it plays over other sounds and it's like I've lost a sense. It's easier to get paranoid.