System of a Down are an Armenian-American heavy metal band known for abrupt tempo changes, aggressive riffs and Serj Tankian's distinctive vocals, and their music has long been reused in short online clips. This particular tone is not tied to one widely documented meme moment; instead it circulates as a fan-made notification, trimmed to just over a second so it can sit alongside other alert sounds. That brevity keeps it useful, because it delivers the band's recognisable intensity without needing a full song, a lyric or a longer intro.