Mountains is a track by Hans Zimmer from the score of Interstellar, the 2014 film about a journey through space and time, where its ticking rhythm mirrors the pressure of a mission running out of time. The five-second excerpt used here captures the track at its most intense, and that intensity made it a natural fit for short-form video. Creators began pairing it with so-called prophecy edits, clips that frame an old prediction, theory or foreshadowed moment as coming true, and the sound has stayed popular because its rising tension works even when viewers have never seen the film.