The Halo theme comes from Halo: Combat Evolved, the first-person shooter released by Bungie and Microsoft in 2001, with music composed by Martin O'Donnell and Michael Salvatori. Its wordless choral opening became one of the most recognisable pieces of video game music, closely linked to the Master Chief and the series' science-fiction world. As Halo grew into a long-running franchise, the melody was reused, remixed and quoted online, and short clips like this one are now shared by fans for montages, tributes and moments when a simple singalong captures the game's epic feel.