The tune is the Call to Post, a traditional bugle call with military roots that became a fixture of North American horse racing. A live bugler plays it as horses step onto the track, a ritual familiar from major meetings including the Kentucky Derby. As short-form video grew, editors borrowed the fanfare outside the sport, using its official, old-fashioned pomp to frame races, chases and contests between friends, pets and game characters as if they were major sporting occasions.