Grand intro sounds like this have become a staple of online video because they borrow the language of trailers, talent shows and stage entrances without needing any footage from those productions. Creators on short-form platforms use the rising swell to signal that something important, surprising or deliberately over-the-top is about to happen, which makes it work just as well for sincere reveals as for ironic ones. Its length gives editors room to time a cut, a zoom or a title card to the peak, and that flexibility is why it keeps appearing in memes, vlogs and gaming clips.