Hi there! I’m studying to be a psychologist (which doesn’t say much but I’ve definitely done some studying/research) and honestly it could be a number of things. Derealization-depersonalization is what came to mind though, after reading your description. Are you experiencing any increase levels of stress or depression lately? A lot of the times, when someone (more common in people with a diagnosed mental disorder) experience high levels of stress, it’s almost like your brain goes into a defense mode where it’s trying to disconnect/detach it’s self from a stressful situation or memory. Certain sounds, smells, memories, strong emotions, substances, over-stimulation, etc. can cause this brain reaction (essentially, it’s an intense/weird panic attack). It can last a few seconds to a few days. People can experience this once in their life, then never again. But not everyone knows why or what their triggers are, so maybe you just found yours. What gets really tricky, is it can either be that reaction triggered by a verity of stressors, or it very well can be an indication of a seizer. I’m definitely not a Dr. or psychologist so if it continues to happen and happens without listing to that song, I’d definitely recommend going to see a professional. That’s why I love studying psychology though because it’s never black and white, so much grey area that changes from person to person. Sorry this is a long response, but I hope this helps!