The melody at the centre of this clip is Hedwig's Theme, the instantly recognisable music associated with the Harry Potter films. Online creators later took that familiar tune and pushed it through heavy distortion, clipping and volume boosting to create earrape versions designed to be deliberately overwhelming. Those loud edits spread through meme videos, short-form edits and soundboards, where the joke depends on hearing something wholesome turned abrasive. It remains popular because the tune is recognised in seconds, so the shock lands immediately even in a very short clip.