Industry analysts found "Grand Theft Auto IV"s marketing much more subtle than Microsoft's marketing of "Halo 3" (2007), identifying Rockstar's interest in controlling the output at all times. The game was marketed through video trailers and press demonstrations. On 29 March 2007, the debut trailer was released. It was narrated by protagonist Niko, and depicts the open world accompanied by the song "Pruit-Igoe" by Philip Glass, originally composed for Godfrey Reggio's 1982 documentary film "Koyaanisqatsi". The second trailer was released on 28 June 2007, showcasing the game's physics engine and featuring the song "Arm in Arm (Shy Child Remix)" by The Boggs. Dan Houser noted that the game was "still rough" when the first trailer was released, but that cutscenes were "coming on board" by the second trailer's release.