Siege of Madrigal Easter Egg - Siege of Madrigal and Microsoft Sam

On Halo 3 on the level "The Covenent" when you fight the two Scarabs kill them and with your hornet fly to the far left side of the structure and you will see a kind of walkway with a slope at the end. Park the Hornet at the start of the path and walk up the walkway and up the slope until you can't go farther and you will hear the song "The Siege of Madrigal." Then if you fly to the far right side of the structure you'll see another walkway. Do the same as on the left side and when you have to stop, stay exactly still for 2-3 minutes and you will hear Microsoft Sam talking about the game.