The sound comes from the Halo theme associated with Bungie's Halo: Combat Evolved, released in 2001 for Xbox. Its chant-like opening became one of the most recognizable pieces of game music, and short clips spread widely in gaming videos, remixes and meme edits. People still use it because a few seconds instantly communicate epic scale, sci fi atmosphere and early 2000s gaming nostalgia. It often appears in the same kind of montage culture as GTA V - Wasted and tactical nuke incoming.