Cymbal swells are a staple of music and sound design, created by striking or rolling a cymbal so its overtones build gradually rather than hitting all at once. In video editing they have become a go-to transition sound because the rising volume signals a change is coming, whether that is a new scene, a joke payoff or a reveal. Short versions like this one are popular for TikTok, Reels and YouTube Shorts, where a creator has only seconds to set up and land a moment. Its shape makes it easy to layer under other audio without muddying the mix.